31913136992 has 96 divisors (see below), whose sum is σ = 72664833024. Its totient is φ = 13658457600.

The previous prime is 31913136977. The next prime is 31913137007. The reversal of 31913136992 is 29963131913.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31913136977) and next prime (31913137007).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 364223 + ... + 443265.

It is an arithmetic number, because the mean of its divisors is an integer number (756925344).

Almost surely, 2^31913136992 is an apocalyptic number.

31913136992 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31913136992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36332416512).

31913136992 is an abundant number, since it is smaller than the sum of its proper divisors (40751696032).

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

31913136992 is a wasteful number, since it uses less digits than its factorization.

31913136992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79132 (or 79124 counting only the distinct ones).

The product of its digits is 236196, while the sum is 47.

The spelling of 31913136992 in words is "thirty-one billion, nine hundred thirteen million, one hundred thirty-six thousand, nine hundred ninety-two".