57131257 has 4 divisors (see below), whose sum is σ = 57287296. Its totient is φ = 56975220.

The previous prime is 57131213. The next prime is 57131279. The reversal of 57131257 is 75213175.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57131257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57131957) 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, 77469 + ... + 78202.

It is an arithmetic number, because the mean of its divisors is an integer number (14321824).

Almost surely, 2^57131257 is an apocalyptic number.

It is an amenable number.

57131257 is a deficient number, since it is larger than the sum of its proper divisors (156039).

57131257 is a wasteful number, since it uses less digits than its factorization.

57131257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156038.

The product of its digits is 7350, while the sum is 31.

The square root of 57131257 is about 7558.5221439115. The cubic root of 57131257 is about 385.1452917642.

The spelling of 57131257 in words is "fifty-seven million, one hundred thirty-one thousand, two hundred fifty-seven".