31331310012 has 144 divisors (see below), whose sum is σ = 85353821280. Its totient is φ = 9655566336.

The previous prime is 31331310001. The next prime is 31331310041. The reversal of 31331310012 is 21001313313.

It is a happy number.

31331310012 is a `hidden beast` number, since 313 + 31 + 310 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8249698 + ... + 8253494.

It is an arithmetic number, because the mean of its divisors is an integer number (592734870).

Almost surely, 2^31331310012 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 31331310012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42676910640).

31331310012 is an abundant number, since it is smaller than the sum of its proper divisors (54022511268).

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

31331310012 is a wasteful number, since it uses less digits than its factorization.

31331310012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060 (or 4055 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31331310012 its reverse (21001313313), we get a palindrome (52332623325).

The spelling of 31331310012 in words is "thirty-one billion, three hundred thirty-one million, three hundred ten thousand, twelve".