31231012 has 24 divisors (see below), whose sum is σ = 57802752. Its totient is φ = 14740800.

The previous prime is 31231009. The next prime is 31231027. The reversal of 31231012 is 21013213.

It is a super-2 number, since 2×31231012² = 1950752221088288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31230983 and 31231001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (2408448).

Almost surely, 2^31231012 is an apocalyptic number.

It is an amenable number.

31231012 is a deficient number, since it is larger than the sum of its proper divisors (26571740).

31231012 is a wasteful number, since it uses less digits than its factorization.

31231012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31231012 is about 5588.4713473364. The cubic root of 31231012 is about 314.9164538659.

Adding to 31231012 its reverse (21013213), we get a palindrome (52244225).

The spelling of 31231012 in words is "thirty-one million, two hundred thirty-one thousand, twelve".