172372717 has 4 divisors (see below), whose sum is σ = 188042976. Its totient is φ = 156702460.

The previous prime is 172372703. The next prime is 172372721. The reversal of 172372717 is 717273271.

172372717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 172372717 - 2¹⁵ = 172339949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172372747) 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, 7835113 + ... + 7835134.

It is an arithmetic number, because the mean of its divisors is an integer number (47010744).

Almost surely, 2^172372717 is an apocalyptic number.

It is an amenable number.

172372717 is a deficient number, since it is larger than the sum of its proper divisors (15670259).

172372717 is a wasteful number, since it uses less digits than its factorization.

172372717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15670258.

The product of its digits is 28812, while the sum is 37.

The square root of 172372717 is about 13129.0790613813. The cubic root of 172372717 is about 556.5311903735.

The spelling of 172372717 in words is "one hundred seventy-two million, three hundred seventy-two thousand, seven hundred seventeen".