56911591 has 8 divisors (see below), whose sum is σ = 64785024. Its totient is φ = 49488120.

The previous prime is 56911579. The next prime is 56911619. The reversal of 56911591 is 19511965.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56911591 - 2¹¹ = 56909543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56911591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56911511) 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, 112221 + ... + 112726.

It is an arithmetic number, because the mean of its divisors is an integer number (8098128).

Almost surely, 2^56911591 is an apocalyptic number.

56911591 is a deficient number, since it is larger than the sum of its proper divisors (7873433).

56911591 is a wasteful number, since it uses less digits than its factorization.

56911591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224981.

The product of its digits is 12150, while the sum is 37.

The square root of 56911591 is about 7543.9771341117. The cubic root of 56911591 is about 384.6510381584.

The spelling of 56911591 in words is "fifty-six million, nine hundred eleven thousand, five hundred ninety-one".