56521631 has 2 divisors, whose sum is σ = 56521632. Its totient is φ = 56521630.

The previous prime is 56521613. The next prime is 56521687. The reversal of 56521631 is 13612565.

Together with previous prime (56521613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56521631 - 2⁶ = 56521567 is a prime.

It is a super-2 number, since 2×56521631² = 6389389541800322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 56521594 and 56521603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56521601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260815 + 28260816.

It is an arithmetic number, because the mean of its divisors is an integer number (28260816).

Almost surely, 2^56521631 is an apocalyptic number.

56521631 is a deficient number, since it is larger than the sum of its proper divisors (1).

56521631 is an equidigital number, since it uses as much as digits as its factorization.

56521631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 56521631 is about 7518.0869242115. The cubic root of 56521631 is about 383.7704768965.

The spelling of 56521631 in words is "fifty-six million, five hundred twenty-one thousand, six hundred thirty-one".