56677921 has 4 divisors (see below), whose sum is σ = 56712112. Its totient is φ = 56643732.

The previous prime is 56677909. The next prime is 56677927. The reversal of 56677921 is 12977665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56677921 - 2⁹ = 56677409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56677927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14475 + ... + 17968.

It is an arithmetic number, because the mean of its divisors is an integer number (14178028).

Almost surely, 2^56677921 is an apocalyptic number.

It is an amenable number.

56677921 is a deficient number, since it is larger than the sum of its proper divisors (34191).

56677921 is a wasteful number, since it uses less digits than its factorization.

56677921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34190.

The product of its digits is 158760, while the sum is 43.

The square root of 56677921 is about 7528.4740153633. The cubic root of 56677921 is about 384.1238772244.

It can be divided in two parts, 566 and 77921, that added together give a palindrome (78487).

The spelling of 56677921 in words is "fifty-six million, six hundred seventy-seven thousand, nine hundred twenty-one".