57085921 has 4 divisors (see below), whose sum is σ = 57111232. Its totient is φ = 57060612.

The previous prime is 57085909. The next prime is 57085933. The reversal of 57085921 is 12958075.

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 an interprime number because it is at equal distance from previous prime (57085909) and next prime (57085933).

It is a cyclic number.

It is not a de Polignac number, because 57085921 - 2²⁵ = 23531489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57085901) 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, 8901 + ... + 13906.

It is an arithmetic number, because the mean of its divisors is an integer number (14277808).

Almost surely, 2^57085921 is an apocalyptic number.

It is an amenable number.

57085921 is a deficient number, since it is larger than the sum of its proper divisors (25311).

57085921 is a wasteful number, since it uses less digits than its factorization.

57085921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25310.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 57085921 is about 7555.5225497645. The cubic root of 57085921 is about 385.0433885996.

The spelling of 57085921 in words is "fifty-seven million, eighty-five thousand, nine hundred twenty-one".