311990943 has 16 divisors (see below), whose sum is σ = 454697856. Its totient is φ = 188713440.

The previous prime is 311990933. The next prime is 311990957. The reversal of 311990943 is 349099113.

It is not a de Polignac number, because 311990943 - 2⁵ = 311990911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311990923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8221 + ... + 26297.

It is an arithmetic number, because the mean of its divisors is an integer number (28418616).

Almost surely, 2^311990943 is an apocalyptic number.

311990943 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

311990943 is a deficient number, since it is larger than the sum of its proper divisors (142706913).

311990943 is a wasteful number, since it uses less digits than its factorization.

311990943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18614.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 311990943 is about 17663.2653549676. The cubic root of 311990943 is about 678.2357256756.

The spelling of 311990943 in words is "three hundred eleven million, nine hundred ninety thousand, nine hundred forty-three".