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List of numbers - Integers
100000000 1000000000 10000000000

Cardinal	One billion (short scale)
Ordinal	One billionth (short scale)
Factorization	29 · 59
Binary	111011100110101100101000000000
Hexadecimal	3B9ACA00

One thousand million (1,000,000,000) is the natural number following 999,999,999 and preceding 1,000,000,001.
In scientific notation, it is written as 109.
In modern ('short scale') English language usage, it is usually called a billion (although in many other languages and 'long scale' usage, a billion means a million millions (or 1,000,000,000,000), instead of a thousand millions).
The term milliard can also be used to refer to 1,000,000,000, though this terminology is rarely used in the English language, but often in other languages.
Physical quantities can be expressed using the SI prefix giga.
See Orders of magnitude (numbers) for larger numbers; and long and short scales.