56517609 has 16 divisors (see below), whose sum is σ = 81171200. Its totient is φ = 34863696.

The previous prime is 56517599. The next prime is 56517631. The reversal of 56517609 is 90671565.

It is not a de Polignac number, because 56517609 - 2⁵ = 56517577 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56517679) 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, 9079 + ... + 13980.

It is an arithmetic number, because the mean of its divisors is an integer number (5073200).

Almost surely, 2^56517609 is an apocalyptic number.

It is an amenable number.

56517609 is a deficient number, since it is larger than the sum of its proper divisors (24653591).

56517609 is a wasteful number, since it uses less digits than its factorization.

56517609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23124.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 56517609 is about 7517.8194311915. The cubic root of 56517609 is about 383.7613738242.

The spelling of 56517609 in words is "fifty-six million, five hundred seventeen thousand, six hundred nine".