31137912 has 96 divisors (see below), whose sum is σ = 93769200. Its totient is φ = 9569664.

The previous prime is 31137889. The next prime is 31137913. The reversal of 31137912 is 21973113.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31137913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36078 + ... + 36930.

Almost surely, 2^31137912 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 31137912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46884600).

31137912 is an abundant number, since it is smaller than the sum of its proper divisors (62631288).

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

31137912 is a wasteful number, since it uses less digits than its factorization.

31137912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 871 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 31137912 is about 5580.1354822262. The cubic root of 31137912 is about 314.6032192371.

It can be divided in two parts, 3113 and 7912, that added together give a square (11025 = 105²).

The spelling of 31137912 in words is "thirty-one million, one hundred thirty-seven thousand, nine hundred twelve".