1000000002

1000000002, written in decimal as 1,000,000,002, is the natural number that follows 1,000,000,001 and precedes 1,000,000,003. It is an even integer greater than 2, and therefore composite.

In terms of prime factors, 1,000,000,002 = 2 × 500,000,001. Since the sum of the digits of 500,000,001 is 6, the latter is divisible by 3, giving 1,000,000,002 = 2 × 3 × 166,666,667. The cofactor 166,666,667 is odd, and its primality is not stated here.

As a near-10^9 value, 1,000,000,002 is often encountered in discussions of large integers and modular arithmetic. It is congruent to 0 modulo 2 and 0 modulo 3, and it is 2 modulo 4 and 3 modulo 9. The number sits near common reference points such as 1,000,000,000 and 1,000,000,003, and it is sometimes used as a test or example value in algorithms and mathematical demonstrations.