56556491 has 2 divisors, whose sum is σ = 56556492. Its totient is φ = 56556490.

The previous prime is 56556473. The next prime is 56556523. The reversal of 56556491 is 19465565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56556491 - 2⁶ = 56556427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (56556421) 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, 28278245 + 28278246.

It is an arithmetic number, because the mean of its divisors is an integer number (28278246).

Almost surely, 2^56556491 is an apocalyptic number.

56556491 is a deficient number, since it is larger than the sum of its proper divisors (1).

56556491 is an equidigital number, since it uses as much as digits as its factorization.

56556491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 41.

The square root of 56556491 is about 7520.4049757975. The cubic root of 56556491 is about 383.8493581387.

The spelling of 56556491 in words is "fifty-six million, five hundred fifty-six thousand, four hundred ninety-one".