31112312 has 64 divisors (see below), whose sum is σ = 77034240. Its totient is φ = 11404800.

The previous prime is 31112311. The next prime is 31112327. The reversal of 31112312 is 21321113.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112311) 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, 8987 + ... + 11957.

It is an arithmetic number, because the mean of its divisors is an integer number (1203660).

Almost surely, 2^31112312 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 31112312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38517120).

31112312 is an abundant number, since it is smaller than the sum of its proper divisors (45921928).

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

31112312 is a wasteful number, since it uses less digits than its factorization.

31112312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012 (or 3008 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 31112312 is about 5577.8411594451. The cubic root of 31112312 is about 314.5169787021.

Adding to 31112312 its reverse (21321113), we get a palindrome (52433425).

The spelling of 31112312 in words is "thirty-one million, one hundred twelve thousand, three hundred twelve".