57065921 has 16 divisors (see below), whose sum is σ = 66078720. Its totient is φ = 48768720.

The previous prime is 57065917. The next prime is 57065933. The reversal of 57065921 is 12956075.

It is not a de Polignac number, because 57065921 - 2² = 57065917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57065941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13016 + ... + 16838.

It is an arithmetic number, because the mean of its divisors is an integer number (4129920).

Almost surely, 2^57065921 is an apocalyptic number.

It is an amenable number.

57065921 is a deficient number, since it is larger than the sum of its proper divisors (9012799).

57065921 is a wasteful number, since it uses less digits than its factorization.

57065921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 57065921 is about 7554.1988986258. The cubic root of 57065921 is about 384.9984168148.

The spelling of 57065921 in words is "fifty-seven million, sixty-five thousand, nine hundred twenty-one".