56631971 has 6 divisors (see below), whose sum is σ = 61807572. Its totient is φ = 51460920.

The previous prime is 56631961. The next prime is 56631977. The reversal of 56631971 is 17913665.

It is not a de Polignac number, because 56631971 - 2⁶ = 56631907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56631977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23825 + ... + 26093.

It is an arithmetic number, because the mean of its divisors is an integer number (10301262).

Almost surely, 2^56631971 is an apocalyptic number.

56631971 is a deficient number, since it is larger than the sum of its proper divisors (5175601).

56631971 is an frugal number, since it uses more digits than its factorization.

56631971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4549 (or 2280 counting only the distinct ones).

The product of its digits is 34020, while the sum is 38.

The square root of 56631971 is about 7525.4216493164. The cubic root of 56631971 is about 384.0200433512.

The spelling of 56631971 in words is "fifty-six million, six hundred thirty-one thousand, nine hundred seventy-one".