31172992 has 16 divisors (see below), whose sum is σ = 62102700. Its totient is φ = 15586432.

The previous prime is 31172989. The next prime is 31173001. The reversal of 31172992 is 29927113.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121642 + ... + 121897.

Almost surely, 2^31172992 is an apocalyptic number.

31172992 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31172992 is a deficient number, since it is larger than the sum of its proper divisors (30929708).

31172992 is an equidigital number, since it uses as much as digits as its factorization.

31172992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243553 (or 243541 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 31172992 is about 5583.2778902720. The cubic root of 31172992 is about 314.7213189889.

The spelling of 31172992 in words is "thirty-one million, one hundred seventy-two thousand, nine hundred ninety-two".