31313312 has 12 divisors (see below), whose sum is σ = 61648146. Its totient is φ = 15656640.

The previous prime is 31313297. The next prime is 31313351. The reversal of 31313312 is 21331313.

It can be written as a sum of positive squares in only one way, i.e., 30958096 + 355216 = 5564^2 + 596^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489239 + ... + 489302.

Almost surely, 2^31313312 is an apocalyptic number.

31313312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31313312 is a deficient number, since it is larger than the sum of its proper divisors (30334834).

31313312 is an equidigital number, since it uses as much as digits as its factorization.

31313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978551 (or 978543 counting only the distinct ones).

The product of its digits is 162, while the sum is 17.

The square root of 31313312 is about 5595.8298758987. The cubic root of 31313312 is about 315.1928339735.

Adding to 31313312 its reverse (21331313), we get a palindrome (52644625).

The spelling of 31313312 in words is "thirty-one million, three hundred thirteen thousand, three hundred twelve".