57457021 has 2 divisors, whose sum is σ = 57457022. Its totient is φ = 57457020.

The previous prime is 57457019. The next prime is 57457039. The reversal of 57457021 is 12075475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 26152996 = 5595^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 57457021 - 2¹ = 57457019 is a prime.

Together with 57457019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57457921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28728510 + 28728511.

It is an arithmetic number, because the mean of its divisors is an integer number (28728511).

Almost surely, 2^57457021 is an apocalyptic number.

It is an amenable number.

57457021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57457021 is an equidigital number, since it uses as much as digits as its factorization.

57457021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 57457021 is about 7580.0409629500. The cubic root of 57457021 is about 385.8759411429.

The spelling of 57457021 in words is "fifty-seven million, four hundred fifty-seven thousand, twenty-one".