311998889 has 8 divisors (see below), whose sum is σ = 320009928. Its totient is φ = 304007040.

The previous prime is 311998877. The next prime is 311998891. The reversal of 311998889 is 988899113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9517225 + 302481664 = 3085^2 + 17392^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 311998889 - 2⁴ = 311998873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311995889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31619 + ... + 40295.

It is an arithmetic number, because the mean of its divisors is an integer number (40001241).

Almost surely, 2^311998889 is an apocalyptic number.

It is an amenable number.

311998889 is a deficient number, since it is larger than the sum of its proper divisors (8011039).

311998889 is an equidigital number, since it uses as much as digits as its factorization.

311998889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9595.

The product of its digits is 1119744, while the sum is 56.

The square root of 311998889 is about 17663.4902836331. The cubic root of 311998889 is about 678.2414835515.

The spelling of 311998889 in words is "three hundred eleven million, nine hundred ninety-eight thousand, eight hundred eighty-nine".