31112113220 has 12 divisors (see below), whose sum is σ = 65335437804. Its totient is φ = 12444845280.

The previous prime is 31112113211. The next prime is 31112113237. The reversal of 31112113220 is 2231121113.

It can be written as a sum of positive squares in 2 ways, for example, as 13430028544 + 17682084676 = 115888^2 + 132974^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777802811 + ... + 777802850.

It is an arithmetic number, because the mean of its divisors is an integer number (5444619817).

Almost surely, 2^31112113220 is an apocalyptic number.

It is an amenable number.

31112113220 is an abundant number, since it is smaller than the sum of its proper divisors (34223324584).

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

31112113220 is a wasteful number, since it uses less digits than its factorization.

31112113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555605670 (or 1555605668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31112113220 its reverse (2231121113), we get a palindrome (33343234333).

The spelling of 31112113220 in words is "thirty-one billion, one hundred twelve million, one hundred thirteen thousand, two hundred twenty".