31142912 has 44 divisors (see below), whose sum is σ = 65954340. Its totient is φ = 14647296.

The previous prime is 31142899. The next prime is 31142921. The reversal of 31142912 is 21924113.

It can be written as a sum of positive squares in 2 ways, for example, as 27206656 + 3936256 = 5216^2 + 1984^2 .

It is a congruent number.

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, 16514 + ... + 18302.

Almost surely, 2^31142912 is an apocalyptic number.

31142912 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31142912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32977170).

31142912 is an abundant number, since it is smaller than the sum of its proper divisors (34811428).

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

31142912 is a wasteful number, since it uses less digits than its factorization.

31142912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826 (or 1808 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 31142912 is about 5580.5834820384. The cubic root of 31142912 is about 314.6200575735.

The spelling of 31142912 in words is "thirty-one million, one hundred forty-two thousand, nine hundred twelve".