31031320012 has 96 divisors (see below), whose sum is σ = 69118769664. Its totient is φ = 11838528000.

The previous prime is 31031320003. The next prime is 31031320031. The reversal of 31031320012 is 21002313013.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9809143 + ... + 9812305.

It is an arithmetic number, because the mean of its divisors is an integer number (719987184).

Almost surely, 2^31031320012 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 31031320012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34559384832).

31031320012 is an abundant number, since it is smaller than the sum of its proper divisors (38087449652).

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

31031320012 is a wasteful number, since it uses less digits than its factorization.

31031320012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839 (or 3837 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31031320012 its reverse (21002313013), we get a palindrome (52033633025).

The spelling of 31031320012 in words is "thirty-one billion, thirty-one million, three hundred twenty thousand, twelve".