billion

}} One billion (1,000,000,000) is the natural number following 9,999,999,99 and preceding 1,000,000,001. (The word "billion" can sometimes refer to 1,000,000,000,000, however in the long scale usage).

In scientific notation, it is written as 10⁹. Physical quantities can be expressed using the SI prefix giga.

Selected 10-digit numbers (1000000001 - 9999999999)

• 1,023,456,789 - smallest pandigital number
• 1,073,676,287 - Carol number
• 1,073,807,359 - Kynea number
• 1,111,111,111 - repunit
• 1,129,760,415 - Motzkin number
• 1,134,903,170 - Fibonacci number
• 1,162,261,467 = 3^19
• 1,220,703,125 = 5^12
• 1,234,567,890 - pandigital number with the digits in order
• 1,311,738,121 - Pell number