31172432 has 20 divisors (see below), whose sum is σ = 60841716. Its totient is φ = 15471360.

The previous prime is 31172431. The next prime is 31172437. The reversal of 31172432 is 23427113.

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 11316496 = 4456^2 + 3364^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31172398 and 31172407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31172431) 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, 4919 + ... + 9302.

Almost surely, 2^31172432 is an apocalyptic number.

It is an amenable number.

31172432 is a deficient number, since it is larger than the sum of its proper divisors (29669284).

31172432 is a wasteful number, since it uses less digits than its factorization.

31172432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14366 (or 14360 counting only the distinct ones).

The product of its digits is 1008, while the sum is 23.

The square root of 31172432 is about 5583.2277402950. The cubic root of 31172432 is about 314.7194343981.

Adding to 31172432 its reverse (23427113), we get a palindrome (54599545).

The spelling of 31172432 in words is "thirty-one million, one hundred seventy-two thousand, four hundred thirty-two".