View source for 1000000000 (number)

{{Refimprove|date=July 2009}}
{| class="infobox"
|-
!colspan=2|[[List of numbers]] – [[Integers]]<br />
[[100000000 (number)|100000000]] '''1000000000''' [[10000000000 (number)|10000000000]]
|-
|[[Cardinal number|Cardinal]]
|One billion ([[long and short scales|short scale]])</br>One thousand million (long scale)
|-
|[[Ordinal number|Ordinal]]
|One billionth (short scale)
|-
|[[Factorization]]
|2<sup>9</sup> · 5<sup>9</sup>
|-
|[[Binary numeral system|Binary]]
|111011100110101100101000000000
|-
|[[Hexadecimal]]
|3B9ACA00
|}
{{Portal|Mathematics}}

'''1,000,000,000''' (one billion, [[long and short scales|short scale]]; one thousand million, long scale) is the [[natural number]] following 999,999,999 and preceding 1,000,000,001.

In [[scientific notation]], it is written as 10<sup>9</sup>.

In modern ([[long and short scales|short scale]]) English usage, it is usually called a billion (although in [[long and short scales|long scale]] usage in many other languages, a billion means 1,000,000,000,000 – a million millions).

In [[South Asian English]], it is known as 100 [[crore]].

The term '''''milliard''''' can also be used to refer to 1,000,000,000; this terminology is rarely used in [[English language|English]] outside of archaic [[British English]] and is rare even there. However this name often appears in [[long and short scales|other languages]].

The [[SI prefix]] [[giga]] indicates 1,000,000,000 times the base unit.

See [[Orders of magnitude (numbers)]] for larger numbers; and [[long and short scales]].

== Selected 10-digit numbers (1000000000–9999999999) ==
*'''1023456789''' – smallest pandigital number in base 10
*'''1026753849''' – smallest pandigital [[square number|square]] that includes 0
*'''1073676287''' – 15th Carol number
*'''1073741824''' = 2<sup>30</sup>
*'''1073807359''' – 14th Kynea number
*'''1129760415''' – 23rd Motzkin number
*'''1134903170''' – 45th Fibonacci number
*'''1162261467''' = 3<sup>19</sup>
*'''1220703125''' = 5<sup>12</sup>
*'''1234567890''' – pandigital number with the digits in order
*'''1311738121''' – 25th Pell number
*'''1382958545''' – 15th Bell number
*'''1406818759''' – 30th Wedderburn-Etherington number
*'''1836311903''' – 46th Fibonacci number
*'''1882341361''' – The least prime whose reversal is both square (40391<sup>2</sup>) and triangular (triangular of 57121).
*'''1977326743''' = 7<sup>11</sup>
*'''2147483647''' – 8th Mersenne prime and the largest signed 32-[[Binary numeral system|bit]] integer
*'''2147483648''' = 2<sup>31</sup>
*'''2214502422''' – 6th primary pseudoperfect number
*'''2357947691''' = 11<sup>9</sup>
*'''2971215073''' – 11th Fibonacci prime (47th Fibonacci number)
*'''3166815962''' – 26th Pell number
*'''3192727797''' – 24th Motzkin number
*'''3323236238''' – 31st Wedderburn-Etherington number
*'''3486784401''' = 3<sup>20</sup>
*'''4294836223''' – 16th Carol number
*'''4294967291''' – Largest prime 32-bit unsigned integer
*'''4294967295''' – Maximum 32-bit unsigned integer (hexadecimal FFFFFFFF)
*'''4294967296''' = 2<sup>32</sup>
*'''4294967297''' – the first composite [[Fermat number]]
*'''4295098367''' – 15th Kynea number
*'''4807526976''' – 48th Fibonacci number
*'''5784634181''' – 13th alternating factorial
*'''6210001000''' – only self-descriptive number in base 10
*'''6227020800''' = 13[[Factorial|!]]
*'''6983776800''' – 15th colossally abundant number
*'''7645370045''' – 27th Pell number
*'''7778742049''' – 49th Fibonacci number
*'''7862958391''' – 32nd Wedderburn-Etherington number
*'''8589869056''' – 6th perfect number
*'''8589934592''' = 2<sup>33</sup>
*'''9043402501''' – 25th Motzkin number
*'''9814072356''' – largest square pandigital number, largest pandigital pure power
*'''9876543210''' – largest pandigital number without redundant digits

== Sense of scale ==
The facts below give a sense of how large 1,000,000,000 (10<sup>9</sup>) is in the context of time according to current scientific evidence:

*10<sup>9</sup> seconds is 114 days short of 32 calendar years (≈ 31.7 years).
*About 10<sup>9</sup> minutes ago, the Roman Empire was flourishing and Christianity was emerging. (10<sup>9</sup> minutes is roughly 1,900 years.)
*About 10<sup>9</sup> hours ago, modern human beings and their ancestors were living in the [[Stone Age]] (more precisely, the Middle Paleolithic). (10<sup>9</sup> hours is roughly 114,000 years.)
*About 10<sup>9</sup> days ago, ''[[Australopithecus]]'', an ape-like creature related to an ancestor of modern humans, roamed the African savannas. (10<sup>9</sup> days is roughly {{Nowrap|2.7 million}} years.)
*About 10<sup>9</sup> months ago, [[dinosaur]]s walked the earth during the late [[Cretaceous]]. (10<sup>9</sup> months is roughly {{Nowrap|82 million}} years.)
*About 10<sup>9</sup> years ago, the first multicellular eukaryotes appeared on Earth.
*The universe is currently thought to be about [[Age of the universe|13.7 × 10<sup>9</sup> years old.]]

In terms of distance:
*10<sup>9</sup> inches is {{convert|15783|mi|km}}, more than halfway around the world and sufficient to reach any point on the globe from any other point.
*10<sup>9</sup> metres is almost three times the distance from the [[Earth]] to the [[Moon]].
*10<sup>9</sup> kilometres is over six times the distance from the Earth to the [[Sun]].

In terms of finance:
*The possession of assets with total value of 10<sup>9</sup> [[United States dollar]]s would place a person among the [[lists of billionaires|world's wealthiest individuals]].
*As visualized in a work by artist Michael Marcovici, this amount of money in stacks of hundred-dollar bills can fit on twelve wrapped [[pallet]]s.<ref>Infosthetics (2009-01-14). [http://infosthetics.com/archives/2009/01/one_billion_dollar_physically_visualized.html One Billion Dollar (Most Expensive Artwork Ever)], viewed 2010-06-17.</ref>

In terms of area:
*A billion square inches would be a square about one half mile on a side.
*A piece of finely woven bed sheet cloth that contained a billion holes would measure about {{convert|500|sqft|m2}}, large enough to cover a moderate sized apartment.

In terms of volume:
*There are a billion cubic millimeters in a cubic meter.
*A billion grains of table salt or granulated sugar would occupy a volume of about two and a half cubic feet.
*A billion cubic inches would be a volume comparable to a large commercial building slightly larger than a typical supermarket.

In terms of natural landscape; a small mountain, slightly larger than [[Stone Mountain]] Georgia, United States, would weigh (have a mass of) a billion tons.

In terms of count:

'''A''' is a cube; '''B''' consists of 1000 cubes of type A. '''C''' consists of 1000 Bs; and '''D''' 1000 Cs. Thus there are {{Nowrap|1 million}} As in C; and 1,000,000,000 As in D. 
[[Image:Billion-cubes-new.svg|754px]]

==References==
{{reflist}}

{{DEFAULTSORT:1000000000 (Number)}}
[[Category:Integers|199e09 1000000000]]
[[Category:numbers]]