57172207 has 4 divisors (see below), whose sum is σ = 60535296. Its totient is φ = 53809120.

The previous prime is 57172201. The next prime is 57172217. The reversal of 57172207 is 70227175.

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 57172207 - 2²³ = 48783599 is a prime.

It is a super-3 number, since 3×57172207³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681519 + ... + 1681552.

It is an arithmetic number, because the mean of its divisors is an integer number (15133824).

Almost surely, 2^57172207 is an apocalyptic number.

57172207 is a deficient number, since it is larger than the sum of its proper divisors (3363089).

57172207 is a wasteful number, since it uses less digits than its factorization.

57172207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363088.

The product of its (nonzero) digits is 6860, while the sum is 31.

The square root of 57172207 is about 7561.2305215487. The cubic root of 57172207 is about 385.2372900490.

The spelling of 57172207 in words is "fifty-seven million, one hundred seventy-two thousand, two hundred seven".