56621491 has 2 divisors, whose sum is σ = 56621492. Its totient is φ = 56621490.

The previous prime is 56621483. The next prime is 56621557. The reversal of 56621491 is 19412665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56621491 - 2³ = 56621483 is a prime.

It is not a weakly prime, because it can be changed into another prime (56621401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28310745 + 28310746.

It is an arithmetic number, because the mean of its divisors is an integer number (28310746).

Almost surely, 2^56621491 is an apocalyptic number.

56621491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56621491 is an equidigital number, since it uses as much as digits as its factorization.

56621491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 56621491 is about 7524.7253106010. The cubic root of 56621491 is about 383.9963536799.

The spelling of 56621491 in words is "fifty-six million, six hundred twenty-one thousand, four hundred ninety-one".