57057391 has 4 divisors (see below), whose sum is σ = 58897984. Its totient is φ = 55216800.

The previous prime is 57057383. The next prime is 57057419. The reversal of 57057391 is 19375075.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57057391 - 2³ = 57057383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57057391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57057191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920250 + ... + 920311.

It is an arithmetic number, because the mean of its divisors is an integer number (14724496).

Almost surely, 2^57057391 is an apocalyptic number.

57057391 is a deficient number, since it is larger than the sum of its proper divisors (1840593).

57057391 is a wasteful number, since it uses less digits than its factorization.

57057391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840592.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 57057391 is about 7553.6342908563. The cubic root of 57057391 is about 384.9792331521.

The spelling of 57057391 in words is "fifty-seven million, fifty-seven thousand, three hundred ninety-one".