57338921 has 2 divisors, whose sum is σ = 57338922. Its totient is φ = 57338920.

The previous prime is 57338899. The next prime is 57338923. The reversal of 57338921 is 12983375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 3463321 = 7340^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 57338921 - 2⁶ = 57338857 is a prime.

It is a super-2 number, since 2×57338921² = 6575503722888482, which contains 22 as substring.

Together with 57338923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57338923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28669460 + 28669461.

It is an arithmetic number, because the mean of its divisors is an integer number (28669461).

Almost surely, 2^57338921 is an apocalyptic number.

It is an amenable number.

57338921 is a deficient number, since it is larger than the sum of its proper divisors (1).

57338921 is an equidigital number, since it uses as much as digits as its factorization.

57338921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 57338921 is about 7572.2467603744. The cubic root of 57338921 is about 385.6113769686.

The spelling of 57338921 in words is "fifty-seven million, three hundred thirty-eight thousand, nine hundred twenty-one".