56556631 has 2 divisors, whose sum is σ = 56556632. Its totient is φ = 56556630.

The previous prime is 56556629. The next prime is 56556649. The reversal of 56556631 is 13665565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56556631 - 2¹ = 56556629 is a prime.

It is a super-2 number, since 2×56556631² = 6397305020140322, which contains 22 as substring.

Together with 56556629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56556691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278315 + 28278316.

It is an arithmetic number, because the mean of its divisors is an integer number (28278316).

Almost surely, 2^56556631 is an apocalyptic number.

56556631 is a deficient number, since it is larger than the sum of its proper divisors (1).

56556631 is an equidigital number, since it uses as much as digits as its factorization.

56556631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 37.

The square root of 56556631 is about 7520.4142838011. The cubic root of 56556631 is about 383.8496748655.

The spelling of 56556631 in words is "fifty-six million, five hundred fifty-six thousand, six hundred thirty-one".