57617921 has 4 divisors (see below), whose sum is σ = 60123072. Its totient is φ = 55112772.

The previous prime is 57617873. The next prime is 57617927. The reversal of 57617921 is 12971675.

57617921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-57617921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57617927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252541 + ... + 1252586.

It is an arithmetic number, because the mean of its divisors is an integer number (15030768).

Almost surely, 2^57617921 is an apocalyptic number.

It is an amenable number.

57617921 is a deficient number, since it is larger than the sum of its proper divisors (2505151).

57617921 is a wasteful number, since it uses less digits than its factorization.

57617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505150.

The product of its digits is 26460, while the sum is 38.

The square root of 57617921 is about 7590.6469421256. The cubic root of 57617921 is about 386.2358018541.

The spelling of 57617921 in words is "fifty-seven million, six hundred seventeen thousand, nine hundred twenty-one".