172328517 has 12 divisors (see below), whose sum is σ = 249386124. Its totient is φ = 114670080.

The previous prime is 172328509. The next prime is 172328531. The reversal of 172328517 is 715823271.

It can be written as a sum of positive squares in 2 ways, for example, as 135349956 + 36978561 = 11634^2 + 6081^2 .

It is not a de Polignac number, because 172328517 - 2³ = 172328509 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172323517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12828 + ... + 22565.

It is an arithmetic number, because the mean of its divisors is an integer number (20782177).

Almost surely, 2^172328517 is an apocalyptic number.

It is an amenable number.

172328517 is a deficient number, since it is larger than the sum of its proper divisors (77057607).

172328517 is a wasteful number, since it uses less digits than its factorization.

172328517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35940 (or 35937 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 172328517 is about 13127.3956670773. The cubic root of 172328517 is about 556.4836175288.

The spelling of 172328517 in words is "one hundred seventy-two million, three hundred twenty-eight thousand, five hundred seventeen".