172317691 has 16 divisors (see below), whose sum is σ = 213035200. Its totient is φ = 135727488.

The previous prime is 172317689. The next prime is 172317709. The reversal of 172317691 is 196713271.

It is not a de Polignac number, because 172317691 - 2¹ = 172317689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172317691.

It is not an unprimeable number, because it can be changed into a prime (172317601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16705 + ... + 24973.

It is an arithmetic number, because the mean of its divisors is an integer number (13314700).

Almost surely, 2^172317691 is an apocalyptic number.

172317691 is a deficient number, since it is larger than the sum of its proper divisors (40717509).

172317691 is a wasteful number, since it uses less digits than its factorization.

172317691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518.

The product of its digits is 15876, while the sum is 37.

The square root of 172317691 is about 13126.9833168173. The cubic root of 172317691 is about 556.4719641706.

The spelling of 172317691 in words is "one hundred seventy-two million, three hundred seventeen thousand, six hundred ninety-one".