31981152 has 48 divisors (see below), whose sum is σ = 95945472. Its totient is φ = 9137280.

The previous prime is 31981133. The next prime is 31981193. The reversal of 31981152 is 25118913.

It is a tau number, because it is divible by the number of its divisors (48).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23124 + ... + 24467.

It is an arithmetic number, because the mean of its divisors is an integer number (1998864).

Almost surely, 2^31981152 is an apocalyptic number.

31981152 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31981152 is an abundant number, since it is smaller than the sum of its proper divisors (63964320).

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

31981152 is a wasteful number, since it uses less digits than its factorization.

31981152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47611 (or 47603 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 31981152 is about 5655.1880605334. The cubic root of 31981152 is about 317.4178662038.

The spelling of 31981152 in words is "thirty-one million, nine hundred eighty-one thousand, one hundred fifty-two".