57172191 has 4 divisors (see below), whose sum is σ = 76229592. Its totient is φ = 38114792.

The previous prime is 57172169. The next prime is 57172201. The reversal of 57172191 is 19127175.

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 57172191 - 2⁶ = 57172127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57172391) 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, 9528696 + ... + 9528701.

It is an arithmetic number, because the mean of its divisors is an integer number (19057398).

Almost surely, 2^57172191 is an apocalyptic number.

57172191 is a deficient number, since it is larger than the sum of its proper divisors (19057401).

57172191 is a wasteful number, since it uses less digits than its factorization.

57172191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19057400.

The product of its digits is 4410, while the sum is 33.

The square root of 57172191 is about 7561.2294635198. The cubic root of 57172191 is about 385.2372541120.

The spelling of 57172191 in words is "fifty-seven million, one hundred seventy-two thousand, one hundred ninety-one".