57391393 has 2 divisors, whose sum is σ = 57391394.
Its totient is φ = 57391392.
The previous prime is 57391391. The next prime is 57391459. The reversal of 57391393 is 39319375.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 31002624 + 26388769 = 5568^2 + 5137^2
It is a cyclic number.
It is not a de Polignac number, because 57391393 - 21 = 57391391 is a prime.
Together with 57391391, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (57391391) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28695696 + 28695697.
It is an arithmetic number, because the mean of its divisors is an integer number (28695697).
Almost surely, 257391393 is an apocalyptic number.
It is an amenable number.
57391393 is a deficient number, since it is larger than the sum of its proper divisors (1).
57391393 is an equidigital number, since it uses as much as digits as its factorization.
57391393 is an evil number, because the sum of its binary digits is even.
The product of its digits is 76545, while the sum is 40.
The square root of 57391393 is about 7575.7107257339.
The cubic root of 57391393 is about 385.7289680151.
The spelling of 57391393 in words is "fifty-seven million, three hundred ninety-one thousand, three hundred ninety-three".