311918981958 has 48 divisors (see below), whose sum is σ = 685430901792. Its totient is φ = 102495456000.

The previous prime is 311918981939. The next prime is 311918981989. The reversal of 311918981958 is 859189819113.

It is a junction number, because it is equal to n+sod(n) for n = 311918981895 and 311918981904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19316568 + ... + 19332708.

It is an arithmetic number, because the mean of its divisors is an integer number (14279810454).

Almost surely, 2^311918981958 is an apocalyptic number.

311918981958 is an abundant number, since it is smaller than the sum of its proper divisors (373511919834).

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

311918981958 is a wasteful number, since it uses less digits than its factorization.

311918981958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31341 (or 31338 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 63.

The spelling of 311918981958 in words is "three hundred eleven billion, nine hundred eighteen million, nine hundred eighty-one thousand, nine hundred fifty-eight".