311981173112 has 32 divisors (see below), whose sum is σ = 668584368000. Its totient is φ = 133695560544.

The previous prime is 311981173103. The next prime is 311981173139. The reversal of 311981173112 is 211371189113.

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, 508139 + ... + 939237.

It is an arithmetic number, because the mean of its divisors is an integer number (20893261500).

Almost surely, 2^311981173112 is an apocalyptic number.

It is an amenable number.

311981173112 is an abundant number, since it is smaller than the sum of its proper divisors (356603194888).

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

311981173112 is a wasteful number, since it uses less digits than its factorization.

311981173112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444035 (or 444031 counting only the distinct ones).

The product of its digits is 9072, while the sum is 38.

The spelling of 311981173112 in words is "three hundred eleven billion, nine hundred eighty-one million, one hundred seventy-three thousand, one hundred twelve".