31311112 has 32 divisors (see below), whose sum is σ = 67320000. Its totient is φ = 13374144.

The previous prime is 31311109. The next prime is 31311113. The reversal of 31311112 is 21111313.

It is a junction number, because it is equal to n+sod(n) for n = 31311092 and 31311101.

It is not an unprimeable number, because it can be changed into a prime (31311113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20139 + ... + 21637.

It is an arithmetic number, because the mean of its divisors is an integer number (2103750).

Almost surely, 2^31311112 is an apocalyptic number.

It is an amenable number.

31311112 is an abundant number, since it is smaller than the sum of its proper divisors (36008888).

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

31311112 is a wasteful number, since it uses less digits than its factorization.

31311112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885 (or 1881 counting only the distinct ones).

The product of its digits is 18, while the sum is 13.

The square root of 31311112 is about 5595.6332974919. The cubic root of 31311112 is about 315.1854522304.

Adding to 31311112 its reverse (21111313), we get a palindrome (52422425).

The spelling of 31311112 in words is "thirty-one million, three hundred eleven thousand, one hundred twelve".