256310531 has 4 divisors (see below), whose sum is σ = 257383200. Its totient is φ = 255237864.

The previous prime is 256310503. The next prime is 256310533. The reversal of 256310531 is 135013652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256310531 - 2²⁶ = 189201667 is a prime.

It is a super-2 number, since 2×256310531² = 131390176603003922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256310531.

It is not an unprimeable number, because it can be changed into a prime (256310533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535976 + ... + 536453.

It is an arithmetic number, because the mean of its divisors is an integer number (64345800).

Almost surely, 2^256310531 is an apocalyptic number.

256310531 is a deficient number, since it is larger than the sum of its proper divisors (1072669).

256310531 is a wasteful number, since it uses less digits than its factorization.

256310531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072668.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 256310531 is about 16009.7011527386. The cubic root of 256310531 is about 635.2170551922.

The spelling of 256310531 in words is "two hundred fifty-six million, three hundred ten thousand, five hundred thirty-one".