56511511 has 4 divisors (see below), whose sum is σ = 64584592. Its totient is φ = 48438432.

The previous prime is 56511509. The next prime is 56511551. The reversal of 56511511 is 11511565.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 56511511 - 2¹ = 56511509 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 (56511551) 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, 4036530 + ... + 4036543.

It is an arithmetic number, because the mean of its divisors is an integer number (16146148).

Almost surely, 2^56511511 is an apocalyptic number.

56511511 is a deficient number, since it is larger than the sum of its proper divisors (8073081).

56511511 is an equidigital number, since it uses as much as digits as its factorization.

56511511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073080.

The product of its digits is 750, while the sum is 25.

The square root of 56511511 is about 7517.4138505207. The cubic root of 56511511 is about 383.7475712763.

The spelling of 56511511 in words is "fifty-six million, five hundred eleven thousand, five hundred eleven".