31999999

31,999,999 is a natural number. In decimal notation it is eight digits long and equals 32,000,000 minus 1. It is odd and ends with 9. Its digit sum is 58, which is not a multiple of 3, so the number is not divisible by 3 or 9. It is not divisible by 2 or 5.

In factorization terms, 32,000,000 factors as 2^11 × 5^6, so 31,999,999 is 32,000,000 minus 1. The primality of 31,999,999 is not indicated by these simple tests; determining its status would require a full factorization or primality test. Its square root is about 5,657, so trial division up to this bound would confirm primality if no factors are found.

Context and usage: There is no widely noted mathematical significance specific to this number in standard references. It may appear in examples illustrating arithmetic near round thresholds, particularly as a boundary value just under 32,000,000. In computer science and mathematics, such numbers are sometimes used to illustrate modular arithmetic with respect to 32,000,000 or as near-miss values for powers of two.