31320912 has 120 divisors (see below), whose sum is σ = 96535488. Its totient is φ = 8570880.

The previous prime is 31320889. The next prime is 31320929. The reversal of 31320912 is 21902313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 322848 + ... + 322944.

Almost surely, 2^31320912 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 31320912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48267744).

31320912 is an abundant number, since it is smaller than the sum of its proper divisors (65214576).

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

31320912 is a wasteful number, since it uses less digits than its factorization.

31320912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31320912 is about 5596.5089118128. The cubic root of 31320912 is about 315.2183318806.

It can be divided in two parts, 313 and 20912, that multiplied together give a palindrome (6545456).

The spelling of 31320912 in words is "thirty-one million, three hundred twenty thousand, nine hundred twelve".