56556531 has 12 divisors (see below), whose sum is σ = 82812808. Its totient is φ = 37187424.

The previous prime is 56556523. The next prime is 56556547. The reversal of 56556531 is 13565565.

56556531 is a `hidden beast` number, since 5 + 65 + 565 + 31 = 666.

It is not a de Polignac number, because 56556531 - 2³ = 56556523 is a prime.

It is a super-2 number, since 2×56556531² = 6397282397507922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56556571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42385 + ... + 43698.

Almost surely, 2^56556531 is an apocalyptic number.

56556531 is a deficient number, since it is larger than the sum of its proper divisors (26256277).

56556531 is a wasteful number, since it uses less digits than its factorization.

56556531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86162 (or 86159 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 56556531 is about 7520.4076352283. The cubic root of 56556531 is about 383.8494486322.

The spelling of 56556531 in words is "fifty-six million, five hundred fifty-six thousand, five hundred thirty-one".