56145591 has 12 divisors (see below), whose sum is σ = 81513432. Its totient is φ = 37239216.

The previous prime is 56145587. The next prime is 56145629. The reversal of 56145591 is 19554165.

56145591 is a `hidden beast` number, since 5 + 61 + 4 + 5 + 591 = 666.

It is not a de Polignac number, because 56145591 - 2² = 56145587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56145091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14061 + ... + 17606.

It is an arithmetic number, because the mean of its divisors is an integer number (6792786).

Almost surely, 2^56145591 is an apocalyptic number.

56145591 is a deficient number, since it is larger than the sum of its proper divisors (25367841).

56145591 is a wasteful number, since it uses less digits than its factorization.

56145591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31870 (or 31867 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 56145591 is about 7493.0361670020. The cubic root of 56145591 is about 382.9175038822.

The spelling of 56145591 in words is "fifty-six million, one hundred forty-five thousand, five hundred ninety-one".