31103112012 has 72 divisors (see below), whose sum is σ = 84599746560. Its totient is φ = 8867970720.

The previous prime is 31103112011. The next prime is 31103112067. The reversal of 31103112012 is 21021130113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31103111982 and 31103112000.

It is not an unprimeable number, because it can be changed into a prime (31103112011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226437 + ... + 336867.

It is an arithmetic number, because the mean of its divisors is an integer number (1174996480).

Almost surely, 2^31103112012 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 31103112012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42299873280).

31103112012 is an abundant number, since it is smaller than the sum of its proper divisors (53496634548).

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

31103112012 is a wasteful number, since it uses less digits than its factorization.

31103112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110931 (or 110922 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31103112012 its reverse (21021130113), we get a palindrome (52124242125).

The spelling of 31103112012 in words is "thirty-one billion, one hundred three million, one hundred twelve thousand, twelve".