311963781990 has 32 divisors (see below), whose sum is σ = 855672088320. Its totient is φ = 71306007264.

The previous prime is 311963781977. The next prime is 311963782001. The reversal of 311963781990 is 99187369113.

It is a self number, because there is not a number n which added to its sum of digits gives 311963781990.

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, 742770700 + ... + 742771119.

It is an arithmetic number, because the mean of its divisors is an integer number (26739752760).

Almost surely, 2^311963781990 is an apocalyptic number.

311963781990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

311963781990 is an abundant number, since it is smaller than the sum of its proper divisors (543708306330).

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

311963781990 is a wasteful number, since it uses less digits than its factorization.

311963781990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485541836.

The product of its (nonzero) digits is 2204496, while the sum is 57.

The spelling of 311963781990 in words is "three hundred eleven billion, nine hundred sixty-three million, seven hundred eighty-one thousand, nine hundred ninety".