56531231 has 8 divisors (see below), whose sum is σ = 57816720. Its totient is φ = 55253952.

The previous prime is 56531219. The next prime is 56531249. The reversal of 56531231 is 13213565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56531231 - 2¹⁴ = 56514847 is a prime.

It is a super-2 number, since 2×56531231² = 6391560156750722, 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 56531231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56531281) 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, 13115 + ... + 16883.

It is an arithmetic number, because the mean of its divisors is an integer number (7227090).

Almost surely, 2^56531231 is an apocalyptic number.

56531231 is a deficient number, since it is larger than the sum of its proper divisors (1285489).

56531231 is a wasteful number, since it uses less digits than its factorization.

56531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105.

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

The square root of 56531231 is about 7518.7253573994. The cubic root of 56531231 is about 383.7922030212.

Adding to 56531231 its reverse (13213565), we get a palindrome (69744796).

The spelling of 56531231 in words is "fifty-six million, five hundred thirty-one thousand, two hundred thirty-one".