57172231 has 4 divisors (see below), whose sum is σ = 57188232. Its totient is φ = 57156232.

The previous prime is 57172223. The next prime is 57172243. The reversal of 57172231 is 13227175.

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 57172231 - 2³ = 57172223 is a prime.

It is a super-2 number, since 2×57172231² = 6537327995034722, which contains 22 as substring.

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 57172231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57172201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81 + ... + 10693.

It is an arithmetic number, because the mean of its divisors is an integer number (14297058).

Almost surely, 2^57172231 is an apocalyptic number.

57172231 is a deficient number, since it is larger than the sum of its proper divisors (16001).

57172231 is a wasteful number, since it uses less digits than its factorization.

57172231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000.

The product of its digits is 2940, while the sum is 28.

The square root of 57172231 is about 7561.2321085918. The cubic root of 57172231 is about 385.2373439546.

The spelling of 57172231 in words is "fifty-seven million, one hundred seventy-two thousand, two hundred thirty-one".