56516591 has 2 divisors, whose sum is σ = 56516592. Its totient is φ = 56516590.

The previous prime is 56516549. The next prime is 56516657. The reversal of 56516591 is 19561565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56516591 is a prime.

It is a super-2 number, since 2×56516591² = 6388250116522562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56516531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28258295 + 28258296.

It is an arithmetic number, because the mean of its divisors is an integer number (28258296).

Almost surely, 2^56516591 is an apocalyptic number.

56516591 is a deficient number, since it is larger than the sum of its proper divisors (1).

56516591 is an equidigital number, since it uses as much as digits as its factorization.

56516591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 38.

The square root of 56516591 is about 7517.7517250838. The cubic root of 56516591 is about 383.7590696962.

The spelling of 56516591 in words is "fifty-six million, five hundred sixteen thousand, five hundred ninety-one".