56711987 has 2 divisors, whose sum is σ = 56711988. Its totient is φ = 56711986.

The previous prime is 56711981. The next prime is 56712041. The reversal of 56711987 is 78911765.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56711987 - 2⁴ = 56711971 is a prime.

It is not a weakly prime, because it can be changed into another prime (56711981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28355993 + 28355994.

It is an arithmetic number, because the mean of its divisors is an integer number (28355994).

Almost surely, 2^56711987 is an apocalyptic number.

56711987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56711987 is an equidigital number, since it uses as much as digits as its factorization.

56711987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 56711987 is about 7530.7361525949. The cubic root of 56711987 is about 384.2008204325.

The spelling of 56711987 in words is "fifty-six million, seven hundred eleven thousand, nine hundred eighty-seven".