31313012 has 24 divisors (see below), whose sum is σ = 56391552. Its totient is φ = 15204800.

The previous prime is 31312999. The next prime is 31313017. The reversal of 31313012 is 21031313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70463 + ... + 70905.

It is an arithmetic number, because the mean of its divisors is an integer number (2349648).

Almost surely, 2^31313012 is an apocalyptic number.

It is an amenable number.

31313012 is a deficient number, since it is larger than the sum of its proper divisors (25078540).

31313012 is a wasteful number, since it uses less digits than its factorization.

31313012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31313012 is about 5595.8030701589. The cubic root of 31313012 is about 315.1918273925.

Adding to 31313012 its reverse (21031313), we get a palindrome (52344325).

The spelling of 31313012 in words is "thirty-one million, three hundred thirteen thousand, twelve".