256931000 has 32 divisors (see below), whose sum is σ = 601220880. Its totient is φ = 102772000.

The previous prime is 256930991. The next prime is 256931009. The reversal of 256931000 is 139652.

256931000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256930991) and next prime (256931009).

It is a super-2 number, since 2×256931000² = 132027077522000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256931009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127466 + ... + 129465.

Almost surely, 2^256931000 is an apocalyptic number.

256931000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256931000 is an abundant number, since it is smaller than the sum of its proper divisors (344289880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256931000 is a wasteful number, since it uses less digits than its factorization.

256931000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256952 (or 256938 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 256931000 is about 16029.0673465427. The cubic root of 256931000 is about 635.7292137338.

The spelling of 256931000 in words is "two hundred fifty-six million, nine hundred thirty-one thousand".