56511911 has 8 divisors (see below), whose sum is σ = 57801600. Its totient is φ = 55233400.

The previous prime is 56511881. The next prime is 56511929. The reversal of 56511911 is 11911565.

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 56511911 - 2¹⁰ = 56510887 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 (56511971) 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, 7886 + ... + 13236.

It is an arithmetic number, because the mean of its divisors is an integer number (7225200).

Almost surely, 2^56511911 is an apocalyptic number.

56511911 is a deficient number, since it is larger than the sum of its proper divisors (1289689).

56511911 is a wasteful number, since it uses less digits than its factorization.

56511911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589.

The product of its digits is 1350, while the sum is 29.

The square root of 56511911 is about 7517.4404553678. The cubic root of 56511911 is about 383.7484766887.

The spelling of 56511911 in words is "fifty-six million, five hundred eleven thousand, nine hundred eleven".