31713172 has 12 divisors (see below), whose sum is σ = 56851956. Its totient is φ = 15469760.

The previous prime is 31713169. The next prime is 31713179. The reversal of 31713172 is 27131713.

It can be written as a sum of positive squares in 2 ways, for example, as 6170256 + 25542916 = 2484^2 + 5054^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31713179) 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, 96523 + ... + 96850.

It is an arithmetic number, because the mean of its divisors is an integer number (4737663).

Almost surely, 2^31713172 is an apocalyptic number.

It is an amenable number.

31713172 is a deficient number, since it is larger than the sum of its proper divisors (25138784).

31713172 is a wasteful number, since it uses less digits than its factorization.

31713172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193418 (or 193416 counting only the distinct ones).

The product of its digits is 882, while the sum is 25.

The square root of 31713172 is about 5631.4449300335. Note that the first 3 decimals coincide. The cubic root of 31713172 is about 316.5287973551.

Adding to 31713172 its reverse (27131713), we get a palindrome (58844885).

The spelling of 31713172 in words is "thirty-one million, seven hundred thirteen thousand, one hundred seventy-two".