57257191 has 4 divisors (see below), whose sum is σ = 57305232. Its totient is φ = 57209152.

The previous prime is 57257183. The next prime is 57257219. The reversal of 57257191 is 19175275.

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 57257191 - 2³ = 57257183 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 57257191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57257131) 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, 22186 + ... + 24631.

It is an arithmetic number, because the mean of its divisors is an integer number (14326308).

Almost surely, 2^57257191 is an apocalyptic number.

57257191 is a deficient number, since it is larger than the sum of its proper divisors (48041).

57257191 is a wasteful number, since it uses less digits than its factorization.

57257191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48040.

The product of its digits is 22050, while the sum is 37.

The square root of 57257191 is about 7566.8481549454. The cubic root of 57257191 is about 385.4280750432.

The spelling of 57257191 in words is "fifty-seven million, two hundred fifty-seven thousand, one hundred ninety-one".