56515515 has 32 divisors (see below), whose sum is σ = 103627776. Its totient is φ = 25764480.

The previous prime is 56515513. The next prime is 56515541. The reversal of 56515515 is 51551565.

It is not a de Polignac number, because 56515515 - 2¹ = 56515513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56515513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65829 + ... + 66681.

It is an arithmetic number, because the mean of its divisors is an integer number (3238368).

Almost surely, 2^56515515 is an apocalyptic number.

56515515 is a deficient number, since it is larger than the sum of its proper divisors (47112261).

56515515 is a wasteful number, since it uses less digits than its factorization.

56515515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499.

The product of its digits is 18750, while the sum is 33.

The square root of 56515515 is about 7517.6801607943. The cubic root of 56515515 is about 383.7566342616.

The spelling of 56515515 in words is "fifty-six million, five hundred fifteen thousand, five hundred fifteen".