56921631 has 16 divisors (see below), whose sum is σ = 81970560. Its totient is φ = 34927200.

The previous prime is 56921621. The next prime is 56921687. The reversal of 56921631 is 13612965.

It is a happy number.

It is not a de Polignac number, because 56921631 - 2⁶ = 56921567 is a prime.

It is a super-2 number, since 2×56921631² = 6480144151400322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56921592 and 56921601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56921621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12856 + ... + 16706.

It is an arithmetic number, because the mean of its divisors is an integer number (5123160).

Almost surely, 2^56921631 is an apocalyptic number.

56921631 is a deficient number, since it is larger than the sum of its proper divisors (25048929).

56921631 is a wasteful number, since it uses less digits than its factorization.

56921631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246.

The product of its digits is 9720, while the sum is 33.

The square root of 56921631 is about 7544.6425362637. The cubic root of 56921631 is about 384.6736561013.

The spelling of 56921631 in words is "fifty-six million, nine hundred twenty-one thousand, six hundred thirty-one".