57539021 has 2 divisors, whose sum is σ = 57539022. Its totient is φ = 57539020.

The previous prime is 57538969. The next prime is 57539023. The reversal of 57539021 is 12093575.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 22905796 = 5885^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 57539021 - 2¹⁴ = 57522637 is a prime.

Together with 57539023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57539023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28769510 + 28769511.

It is an arithmetic number, because the mean of its divisors is an integer number (28769511).

Almost surely, 2^57539021 is an apocalyptic number.

It is an amenable number.

57539021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57539021 is an equidigital number, since it uses as much as digits as its factorization.

57539021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 57539021 is about 7585.4479762239. The cubic root of 57539021 is about 386.0594219776.

The spelling of 57539021 in words is "fifty-seven million, five hundred thirty-nine thousand, twenty-one".