31303312 has 40 divisors (see below), whose sum is σ = 62656704. Its totient is φ = 15141504.

The previous prime is 31303303. The next prime is 31303313. The reversal of 31303312 is 21330313.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (31303313) 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 7 ways as a sum of consecutive naturals, for example, 118893 + ... + 119155.

Almost surely, 2^31303312 is an apocalyptic number.

It is an amenable number.

31303312 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

31303312 is a wasteful number, since it uses less digits than its factorization.

31303312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 31303312 is about 5594.9362820322. The cubic root of 31303312 is about 315.1592778092.

Adding to 31303312 its reverse (21330313), we get a palindrome (52633625).

The spelling of 31303312 in words is "thirty-one million, three hundred three thousand, three hundred twelve".