56937721 has 4 divisors (see below), whose sum is σ = 57314944. Its totient is φ = 56560500.

The previous prime is 56937703. The next prime is 56937757. The reversal of 56937721 is 12773965.

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 56937721 - 2⁵ = 56937689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56937761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188385 + ... + 188686.

It is an arithmetic number, because the mean of its divisors is an integer number (14328736).

Almost surely, 2^56937721 is an apocalyptic number.

It is an amenable number.

56937721 is a deficient number, since it is larger than the sum of its proper divisors (377223).

56937721 is a wasteful number, since it uses less digits than its factorization.

56937721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377222.

The product of its digits is 79380, while the sum is 40.

The square root of 56937721 is about 7545.7087804924. The cubic root of 56937721 is about 384.7098978365.

The spelling of 56937721 in words is "fifty-six million, nine hundred thirty-seven thousand, seven hundred twenty-one".