31980331989 has 12 divisors (see below), whose sum is σ = 47442294796. Its totient is φ = 20743998912.

The previous prime is 31980331979. The next prime is 31980332039. The reversal of 31980331989 is 98913308913.

31980331989 is a `hidden beast` number, since 319 + 8 + 0 + 3 + 319 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26746967025 + 5233364964 = 163545^2 + 72342^2 .

It is not a de Polignac number, because 31980331989 - 2⁷ = 31980331861 is a prime.

It is a super-2 number, since 2×31980331989² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31980331979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48018184 + ... + 48018849.

Almost surely, 2^31980331989 is an apocalyptic number.

It is an amenable number.

31980331989 is a deficient number, since it is larger than the sum of its proper divisors (15461962807).

31980331989 is a wasteful number, since it uses less digits than its factorization.

31980331989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96037076 (or 96037073 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 31980331989 in words is "thirty-one billion, nine hundred eighty million, three hundred thirty-one thousand, nine hundred eighty-nine".