172375531 has 12 divisors (see below), whose sum is σ = 179280192. Its totient is φ = 165726000.

The previous prime is 172375513. The next prime is 172375537. The reversal of 172375531 is 135573271.

It is not a de Polignac number, because 172375531 - 2²¹ = 170278379 is a prime.

It is a super-2 number, since 2×172375531² = 59426647375063922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172375537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173446 + ... + 174436.

It is an arithmetic number, because the mean of its divisors is an integer number (14940016).

Almost surely, 2^172375531 is an apocalyptic number.

172375531 is a deficient number, since it is larger than the sum of its proper divisors (6904661).

172375531 is an equidigital number, since it uses as much as digits as its factorization.

172375531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234 (or 1203 counting only the distinct ones).

The product of its digits is 22050, while the sum is 34.

The square root of 172375531 is about 13129.1862276380. The cubic root of 172375531 is about 556.5342188308.

The spelling of 172375531 in words is "one hundred seventy-two million, three hundred seventy-five thousand, five hundred thirty-one".