31717172 has 18 divisors (see below), whose sum is σ = 58964262. Its totient is φ = 14925184.

The previous prime is 31717163. The next prime is 31717193. The reversal of 31717172 is 27171713.

It can be written as a sum of positive squares in 3 ways, for example, as 13278736 + 18438436 = 3644^2 + 4294^2 .

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, 12563 + ... + 14874.

Almost surely, 2^31717172 is an apocalyptic number.

It is an amenable number.

31717172 is a deficient number, since it is larger than the sum of its proper divisors (27247090).

31717172 is a wasteful number, since it uses less digits than its factorization.

31717172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27475 (or 27456 counting only the distinct ones).

The product of its digits is 2058, while the sum is 29.

The square root of 31717172 is about 5631.8000674740. The cubic root of 31717172 is about 316.5421047800.

Adding to 31717172 its reverse (27171713), we get a palindrome (58888885).

The spelling of 31717172 in words is "thirty-one million, seven hundred seventeen thousand, one hundred seventy-two".