56591987 has 2 divisors, whose sum is σ = 56591988. Its totient is φ = 56591986.

The previous prime is 56591971. The next prime is 56592007. The reversal of 56591987 is 78919565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56591987 - 2⁴ = 56591971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56591917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28295993 + 28295994.

It is an arithmetic number, because the mean of its divisors is an integer number (28295994).

Almost surely, 2^56591987 is an apocalyptic number.

56591987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56591987 is an equidigital number, since it uses as much as digits as its factorization.

56591987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 56591987 is about 7522.7645849116. The cubic root of 56591987 is about 383.9296452234.

The spelling of 56591987 in words is "fifty-six million, five hundred ninety-one thousand, nine hundred eighty-seven".