56261591 has 2 divisors, whose sum is σ = 56261592. Its totient is φ = 56261590.

The previous prime is 56261573. The next prime is 56261593. The reversal of 56261591 is 19516265.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56261591 - 2²² = 52067287 is a prime.

Together with 56261593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56261593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28130795 + 28130796.

It is an arithmetic number, because the mean of its divisors is an integer number (28130796).

Almost surely, 2^56261591 is an apocalyptic number.

56261591 is a deficient number, since it is larger than the sum of its proper divisors (1).

56261591 is an equidigital number, since it uses as much as digits as its factorization.

56261591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 56261591 is about 7500.7726935296. The cubic root of 56261591 is about 383.1810322934.

The spelling of 56261591 in words is "fifty-six million, two hundred sixty-one thousand, five hundred ninety-one".