231312012 has 48 divisors (see below), whose sum is σ = 578441472. Its totient is φ = 71755200.

The previous prime is 231312001. The next prime is 231312019. The reversal of 231312012 is 210213132.

231312012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231311982 and 231312000.

It is not an unprimeable number, because it can be changed into a prime (231312019) 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 15 ways as a sum of consecutive naturals, for example, 1114 + ... + 21537.

It is an arithmetic number, because the mean of its divisors is an integer number (12050864).

Almost surely, 2^231312012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231312012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289220736).

231312012 is an abundant number, since it is smaller than the sum of its proper divisors (347129460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231312012 is a wasteful number, since it uses less digits than its factorization.

231312012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22718 (or 22716 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 231312012 is about 15208.9451310734. The cubic root of 231312012 is about 613.8553737744.

Adding to 231312012 its reverse (210213132), we get a palindrome (441525144).

It can be divided in two parts, 2313120 and 12, that added together give a palindrome (2313132).

The spelling of 231312012 in words is "two hundred thirty-one million, three hundred twelve thousand, twelve".