31305812 has 12 divisors (see below), whose sum is σ = 54905760. Its totient is φ = 15618456.

The previous prime is 31305793. The next prime is 31305851. The reversal of 31305812 is 21850313.

It is a congruent number.

It is an unprimeable number.

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, 6512 + ... + 10247.

It is an arithmetic number, because the mean of its divisors is an integer number (4575480).

Almost surely, 2^31305812 is an apocalyptic number.

It is an amenable number.

31305812 is a deficient number, since it is larger than the sum of its proper divisors (23599948).

31305812 is a wasteful number, since it uses less digits than its factorization.

31305812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17230 (or 17228 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 31305812 is about 5595.1596938783. The cubic root of 31305812 is about 315.1676675202.

The spelling of 31305812 in words is "thirty-one million, three hundred five thousand, eight hundred twelve".