31113012 has 48 divisors (see below), whose sum is σ = 83486592. Its totient is φ = 8833920.

The previous prime is 31113011. The next prime is 31113023. The reversal of 31113012 is 21031113.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13462 + ... + 15602.

It is an arithmetic number, because the mean of its divisors is an integer number (1739304).

Almost surely, 2^31113012 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 31113012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41743296).

31113012 is an abundant number, since it is smaller than the sum of its proper divisors (52373580).

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

31113012 is a wasteful number, since it uses less digits than its factorization.

31113012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31113012 is about 5577.9039073831. The cubic root of 31113012 is about 314.5193374707.

Adding to 31113012 its reverse (21031113), we get a palindrome (52144125).

The spelling of 31113012 in words is "thirty-one million, one hundred thirteen thousand, twelve".