31320312 has 16 divisors (see below), whose sum is σ = 78300840. Its totient is φ = 10440096.

The previous prime is 31320281. The next prime is 31320337. The reversal of 31320312 is 21302313.

It is a junction number, because it is equal to n+sod(n) for n = 31320291 and 31320300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652483 + ... + 652530.

Almost surely, 2^31320312 is an apocalyptic number.

It is an amenable number.

31320312 is an abundant number, since it is smaller than the sum of its proper divisors (46980528).

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

31320312 is a wasteful number, since it uses less digits than its factorization.

31320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305022 (or 1305018 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31320312 is about 5596.4553067098. The cubic root of 31320312 is about 315.2163190379.

Adding to 31320312 its reverse (21302313), we get a palindrome (52622625).

The spelling of 31320312 in words is "thirty-one million, three hundred twenty thousand, three hundred twelve".