56442921 has 4 divisors (see below), whose sum is σ = 75257232. Its totient is φ = 37628612.

The previous prime is 56442917. The next prime is 56442931. The reversal of 56442921 is 12924465.

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 56442921 - 2² = 56442917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56442931) 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, 9407151 + ... + 9407156.

It is an arithmetic number, because the mean of its divisors is an integer number (18814308).

Almost surely, 2^56442921 is an apocalyptic number.

It is an amenable number.

56442921 is a deficient number, since it is larger than the sum of its proper divisors (18814311).

56442921 is a wasteful number, since it uses less digits than its factorization.

56442921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18814310.

The product of its digits is 17280, while the sum is 33.

The square root of 56442921 is about 7512.8503911631. The cubic root of 56442921 is about 383.5922524652.

The spelling of 56442921 in words is "fifty-six million, four hundred forty-two thousand, nine hundred twenty-one".