57997021 has 2 divisors, whose sum is σ = 57997022. Its totient is φ = 57997020.

The previous prime is 57996971. The next prime is 57997033. The reversal of 57997021 is 12079975.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57972996 + 24025 = 7614^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 57997021 - 2¹⁵ = 57964253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57997061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28998510 + 28998511.

It is an arithmetic number, because the mean of its divisors is an integer number (28998511).

Almost surely, 2^57997021 is an apocalyptic number.

It is an amenable number.

57997021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57997021 is an equidigital number, since it uses as much as digits as its factorization.

57997021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 57997021 is about 7615.5775224207. The cubic root of 57997021 is about 387.0810367415.

The spelling of 57997021 in words is "fifty-seven million, nine hundred ninety-seven thousand, twenty-one".