172931031 has 80 divisors (see below), whose sum is σ = 329313600. Its totient is φ = 87962112.

The previous prime is 172931029. The next prime is 172931041. The reversal of 172931031 is 130139271.

It is not a de Polignac number, because 172931031 - 2¹ = 172931029 is a prime.

It is a super-2 number, since 2×172931031² = 59810282965445922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 172930986 and 172931004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172931041) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 213355 + ... + 214163.

It is an arithmetic number, because the mean of its divisors is an integer number (4116420).

Almost surely, 2^172931031 is an apocalyptic number.

172931031 is a deficient number, since it is larger than the sum of its proper divisors (156382569).

172931031 is a wasteful number, since it uses less digits than its factorization.

172931031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 861 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 172931031 is about 13150.3243686230. The cubic root of 172931031 is about 557.1314096549.

The spelling of 172931031 in words is "one hundred seventy-two million, nine hundred thirty-one thousand, thirty-one".