311949181864 has 8 divisors (see below), whose sum is σ = 584904716010. Its totient is φ = 155974590928.

The previous prime is 311949181847. The next prime is 311949181919. The reversal of 311949181864 is 468181949113.

It can be written as a sum of positive squares in only one way, i.e., 177795468964 + 134153712900 = 421658^2 + 366270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19496823859 + ... + 19496823874.

Almost surely, 2^311949181864 is an apocalyptic number.

It is an amenable number.

311949181864 is a deficient number, since it is larger than the sum of its proper divisors (272955534146).

311949181864 is a wasteful number, since it uses less digits than its factorization.

311949181864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38993647739 (or 38993647735 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The spelling of 311949181864 in words is "three hundred eleven billion, nine hundred forty-nine million, one hundred eighty-one thousand, eight hundred sixty-four".