56631499121 has 2 divisors, whose sum is σ = 56631499122. Its totient is φ = 56631499120.

The previous prime is 56631499049. The next prime is 56631499147. The reversal of 56631499121 is 12199413665.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40828243600 + 15803255521 = 202060^2 + 125711^2 .

It is a cyclic number.

It is not a de Polignac number, because 56631499121 - 2²² = 56627304817 is a prime.

It is not a weakly prime, because it can be changed into another prime (56631499151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28315749560 + 28315749561.

It is an arithmetic number, because the mean of its divisors is an integer number (28315749561).

Almost surely, 2^56631499121 is an apocalyptic number.

It is an amenable number.

56631499121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56631499121 is an equidigital number, since it uses as much as digits as its factorization.

56631499121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The spelling of 56631499121 in words is "fifty-six billion, six hundred thirty-one million, four hundred ninety-nine thousand, one hundred twenty-one".