172189931 has 4 divisors (see below), whose sum is σ = 176194392. Its totient is φ = 168185472.

The previous prime is 172189883. The next prime is 172189961. The reversal of 172189931 is 139981271.

It is a happy number.

172189931 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.

It is a cyclic number.

It is not a de Polignac number, because 172189931 - 2²² = 167995627 is a prime.

It is a super-2 number, since 2×172189931² = 59298744675569522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172189961) 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, 2002166 + ... + 2002251.

It is an arithmetic number, because the mean of its divisors is an integer number (44048598).

Almost surely, 2^172189931 is an apocalyptic number.

172189931 is a deficient number, since it is larger than the sum of its proper divisors (4004461).

172189931 is an equidigital number, since it uses as much as digits as its factorization.

172189931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004460.

The product of its digits is 27216, while the sum is 41.

The square root of 172189931 is about 13122.1161022146. The cubic root of 172189931 is about 556.3344034528.

The spelling of 172189931 in words is "one hundred seventy-two million, one hundred eighty-nine thousand, nine hundred thirty-one".