56251613491 has 2 divisors, whose sum is σ = 56251613492. Its totient is φ = 56251613490.

The previous prime is 56251613479. The next prime is 56251613563. The reversal of 56251613491 is 19431615265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56251613491 - 2⁹ = 56251612979 is a prime.

It is not a weakly prime, because it can be changed into another prime (56251613401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28125806745 + 28125806746.

It is an arithmetic number, because the mean of its divisors is an integer number (28125806746).

Almost surely, 2^56251613491 is an apocalyptic number.

56251613491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56251613491 is an equidigital number, since it uses as much as digits as its factorization.

56251613491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The spelling of 56251613491 in words is "fifty-six billion, two hundred fifty-one million, six hundred thirteen thousand, four hundred ninety-one".