31299312 has 120 divisors (see below), whose sum is σ = 94400208. Its totient is φ = 8898560.

The previous prime is 31299293. The next prime is 31299347. The reversal of 31299312 is 21399213.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31299312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98578 + ... + 98894.

Almost surely, 2^31299312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31299312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47200104).

31299312 is an abundant number, since it is smaller than the sum of its proper divisors (63100896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31299312 is a wasteful number, since it uses less digits than its factorization.

31299312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 350 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 31299312 is about 5594.5788045214. The cubic root of 31299312 is about 315.1458533425.

Subtracting from 31299312 its reverse (21399213), we obtain a palindrome (9900099).

The spelling of 31299312 in words is "thirty-one million, two hundred ninety-nine thousand, three hundred twelve".