56531015 has 4 divisors (see below), whose sum is σ = 67837224. Its totient is φ = 45224808.

The previous prime is 56531009. The next prime is 56531017. The reversal of 56531015 is 51013565.

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 56531015 - 2¹⁴ = 56514631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56531017) 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, 5653097 + ... + 5653106.

It is an arithmetic number, because the mean of its divisors is an integer number (16959306).

Almost surely, 2^56531015 is an apocalyptic number.

56531015 is a deficient number, since it is larger than the sum of its proper divisors (11306209).

56531015 is a wasteful number, since it uses less digits than its factorization.

56531015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11306208.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 56531015 is about 7518.7109932488. The cubic root of 56531015 is about 383.7917142105.

The spelling of 56531015 in words is "fifty-six million, five hundred thirty-one thousand, fifteen".