31129912 has 24 divisors (see below), whose sum is σ = 64159200. Its totient is φ = 14149520.

The previous prime is 31129909. The next prime is 31129927. The reversal of 31129912 is 21992113.

It is a super-2 number, since 2×31129912² = 1938142842255488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15112 + ... + 17047.

It is an arithmetic number, because the mean of its divisors is an integer number (2673300).

Almost surely, 2^31129912 is an apocalyptic number.

It is an amenable number.

31129912 is an abundant number, since it is smaller than the sum of its proper divisors (33029288).

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

31129912 is a wasteful number, since it uses less digits than its factorization.

31129912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32187 (or 32172 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 31129912 is about 5579.4186077046. The cubic root of 31129912 is about 314.5762741493.

It can be divided in two parts, 31129 and 912, that added together give a square (32041 = 179²).

The spelling of 31129912 in words is "thirty-one million, one hundred twenty-nine thousand, nine hundred twelve".