172125917 has 4 divisors (see below), whose sum is σ = 173830236. Its totient is φ = 170421600.

The previous prime is 172125907. The next prime is 172125923. The reversal of 172125917 is 719521271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719521271 = 7 ⋅102788753.

It can be written as a sum of positive squares in 2 ways, for example, as 87871876 + 84254041 = 9374^2 + 9179^2 .

It is a cyclic number.

It is not a de Polignac number, because 172125917 - 2⁶ = 172125853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172125907) 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, 852008 + ... + 852209.

It is an arithmetic number, because the mean of its divisors is an integer number (43457559).

Almost surely, 2^172125917 is an apocalyptic number.

It is an amenable number.

172125917 is a deficient number, since it is larger than the sum of its proper divisors (1704319).

172125917 is a wasteful number, since it uses less digits than its factorization.

172125917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704318.

The product of its digits is 8820, while the sum is 35.

The square root of 172125917 is about 13119.6767109560. The cubic root of 172125917 is about 556.2654532255.

The spelling of 172125917 in words is "one hundred seventy-two million, one hundred twenty-five thousand, nine hundred seventeen".