311921557318 has 16 divisors (see below), whose sum is σ = 538003180800. Its totient is φ = 132860539656.

The previous prime is 311921557309. The next prime is 311921557373. The reversal of 311921557318 is 813755129113.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68341618 + ... + 68346181.

It is an arithmetic number, because the mean of its divisors is an integer number (33625198800).

Almost surely, 2^311921557318 is an apocalyptic number.

311921557318 is a deficient number, since it is larger than the sum of its proper divisors (226081623482).

311921557318 is a wasteful number, since it uses less digits than its factorization.

311921557318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136687971.

The product of its digits is 226800, while the sum is 46.

The spelling of 311921557318 in words is "three hundred eleven billion, nine hundred twenty-one million, five hundred fifty-seven thousand, three hundred eighteen".