256199031 has 56 divisors (see below), whose sum is σ = 429365376. Its totient is φ = 151457040.

The previous prime is 256199029. The next prime is 256199057. The reversal of 256199031 is 130991652.

256199031 is a `hidden beast` number, since 2 + 5 + 619 + 9 + 0 + 31 = 666.

It is not a de Polignac number, because 256199031 - 2¹ = 256199029 is a prime.

It is a super-2 number, since 2×256199031² = 131275886970677922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256199081) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 344446 + ... + 345188.

Almost surely, 2^256199031 is an apocalyptic number.

256199031 is a deficient number, since it is larger than the sum of its proper divisors (173166345).

256199031 is an equidigital number, since it uses as much as digits as its factorization.

256199031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 256199031 is about 16006.2185103165. The cubic root of 256199031 is about 635.1249312957.

The spelling of 256199031 in words is "two hundred fifty-six million, one hundred ninety-nine thousand, thirty-one".