31981332 has 24 divisors (see below), whose sum is σ = 78551200. Its totient is φ = 10099296.

The previous prime is 31981321. The next prime is 31981361. The reversal of 31981332 is 23318913.

It is a self number, because there is not a number n which added to its sum of digits gives 31981332.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69907 + ... + 70362.

Almost surely, 2^31981332 is an apocalyptic number.

It is an amenable number.

31981332 is an abundant number, since it is smaller than the sum of its proper divisors (46569868).

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

31981332 is a wasteful number, since it uses less digits than its factorization.

31981332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140295 (or 140293 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 31981332 is about 5655.2039751012. The cubic root of 31981332 is about 317.4184617120.

The spelling of 31981332 in words is "thirty-one million, nine hundred eighty-one thousand, three hundred thirty-two".