56251615531 has 16 divisors (see below), whose sum is σ = 57365812224. Its totient is φ = 55151289504.

The previous prime is 56251615489. The next prime is 56251615547. The reversal of 56251615531 is 13551615265.

It is a happy number.

56251615531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 56251615531 - 2⁹ = 56251615019 is a prime.

It is a super-2 number, since 2×56251615531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56251615831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4121140 + ... + 4134766.

It is an arithmetic number, because the mean of its divisors is an integer number (3585363264).

Almost surely, 2^56251615531 is an apocalyptic number.

56251615531 is a deficient number, since it is larger than the sum of its proper divisors (1114196693).

56251615531 is a wasteful number, since it uses less digits than its factorization.

56251615531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14130.

The product of its digits is 135000, while the sum is 40.

The spelling of 56251615531 in words is "fifty-six billion, two hundred fifty-one million, six hundred fifteen thousand, five hundred thirty-one".