172131316 has 18 divisors (see below), whose sum is σ = 350410578. Its totient is φ = 73770480.

The previous prime is 172131259. The next prime is 172131353. The reversal of 172131316 is 613131271.

It can be written as a sum of positive squares in only one way, i.e., 145298916 + 26832400 = 12054^2 + 5180^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 438915 + ... + 439306.

Almost surely, 2^172131316 is an apocalyptic number.

It is an amenable number.

172131316 is an abundant number, since it is smaller than the sum of its proper divisors (178279262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172131316 is a wasteful number, since it uses less digits than its factorization.

172131316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878239 (or 878230 counting only the distinct ones).

The product of its digits is 756, while the sum is 25.

The square root of 172131316 is about 13119.8824689858. The cubic root of 172131316 is about 556.2712692116.

Adding to 172131316 its reverse (613131271), we get a palindrome (785262587).

The spelling of 172131316 in words is "one hundred seventy-two million, one hundred thirty-one thousand, three hundred sixteen".