56872921 has 4 divisors (see below), whose sum is σ = 64997632. Its totient is φ = 48748212.

The previous prime is 56872919. The next prime is 56872931. The reversal of 56872921 is 12927865.

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 56872921 - 2¹ = 56872919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56872901) 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 3 ways as a sum of consecutive naturals, for example, 4062345 + ... + 4062358.

It is an arithmetic number, because the mean of its divisors is an integer number (16249408).

Almost surely, 2^56872921 is an apocalyptic number.

It is an amenable number.

56872921 is a deficient number, since it is larger than the sum of its proper divisors (8124711).

56872921 is an equidigital number, since it uses as much as digits as its factorization.

56872921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8124710.

The product of its digits is 60480, while the sum is 40.

The square root of 56872921 is about 7541.4137268817. The cubic root of 56872921 is about 384.5638981717.

The spelling of 56872921 in words is "fifty-six million, eight hundred seventy-two thousand, nine hundred twenty-one".