56405977 has 2 divisors, whose sum is σ = 56405978. Its totient is φ = 56405976.

The previous prime is 56405971. The next prime is 56406011. The reversal of 56405977 is 77950465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35712576 + 20693401 = 5976^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 56405977 - 2¹¹ = 56403929 is a prime.

It is not a weakly prime, because it can be changed into another prime (56405971) 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, 28202988 + 28202989.

It is an arithmetic number, because the mean of its divisors is an integer number (28202989).

Almost surely, 2^56405977 is an apocalyptic number.

It is an amenable number.

56405977 is a deficient number, since it is larger than the sum of its proper divisors (1).

56405977 is an equidigital number, since it uses as much as digits as its factorization.

56405977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 56405977 is about 7510.3912681031. The cubic root of 56405977 is about 383.5085423798.

The spelling of 56405977 in words is "fifty-six million, four hundred five thousand, nine hundred seventy-seven".