256531695 has 16 divisors (see below), whose sum is σ = 469086720. Its totient is φ = 117271584.

The previous prime is 256531663. The next prime is 256531721. The reversal of 256531695 is 596135652.

It is not a de Polignac number, because 256531695 - 2⁵ = 256531663 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221475 + ... + 1221684.

It is an arithmetic number, because the mean of its divisors is an integer number (29317920).

Almost surely, 2^256531695 is an apocalyptic number.

256531695 is a deficient number, since it is larger than the sum of its proper divisors (212555025).

256531695 is a wasteful number, since it uses less digits than its factorization.

256531695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443174.

The product of its digits is 243000, while the sum is 42.

The square root of 256531695 is about 16016.6068503913. The cubic root of 256531695 is about 635.3997070143.

The spelling of 256531695 in words is "two hundred fifty-six million, five hundred thirty-one thousand, six hundred ninety-five".