56521977 has 16 divisors (see below), whose sum is σ = 77680512. Its totient is φ = 36529920.

The previous prime is 56521973. The next prime is 56521981. The reversal of 56521977 is 77912565.

It is an interprime number because it is at equal distance from previous prime (56521973) and next prime (56521981).

It is not a de Polignac number, because 56521977 - 2² = 56521973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56521973) 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 in 15 ways as a sum of consecutive naturals, for example, 36652 + ... + 38162.

It is an arithmetic number, because the mean of its divisors is an integer number (4855032).

Almost surely, 2^56521977 is an apocalyptic number.

It is an amenable number.

56521977 is a deficient number, since it is larger than the sum of its proper divisors (21158535).

56521977 is a wasteful number, since it uses less digits than its factorization.

56521977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888.

The product of its digits is 132300, while the sum is 42.

The square root of 56521977 is about 7518.1099353494. The cubic root of 56521977 is about 383.7712599850.

The spelling of 56521977 in words is "fifty-six million, five hundred twenty-one thousand, nine hundred seventy-seven".