31319312 has 20 divisors (see below), whose sum is σ = 60800796. Its totient is φ = 15628800.

The previous prime is 31319311. The next prime is 31319359. The reversal of 31319312 is 21391313.

It can be written as a sum of positive squares in 2 ways, for example, as 26584336 + 4734976 = 5156^2 + 2176^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7988 + ... + 11244.

Almost surely, 2^31319312 is an apocalyptic number.

It is an amenable number.

31319312 is a deficient number, since it is larger than the sum of its proper divisors (29481484).

31319312 is a wasteful number, since it uses less digits than its factorization.

31319312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866 (or 3860 counting only the distinct ones).

The product of its digits is 486, while the sum is 23.

The square root of 31319312 is about 5596.3659637304. The cubic root of 31319312 is about 315.2129642430.

The spelling of 31319312 in words is "thirty-one million, three hundred nineteen thousand, three hundred twelve".