311989809 has 32 divisors (see below), whose sum is σ = 437772160. Its totient is φ = 197448192.

The previous prime is 311989793. The next prime is 311989813. The reversal of 311989809 is 908989113.

It is not a de Polignac number, because 311989809 - 2⁴ = 311989793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311989819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1126179 + ... + 1126455.

It is an arithmetic number, because the mean of its divisors is an integer number (13680380).

Almost surely, 2^311989809 is an apocalyptic number.

It is an amenable number.

311989809 is a deficient number, since it is larger than the sum of its proper divisors (125782351).

311989809 is a wasteful number, since it uses less digits than its factorization.

311989809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529.

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 311989809 is about 17663.2332544186. The cubic root of 311989809 is about 678.2349039421.

The spelling of 311989809 in words is "three hundred eleven million, nine hundred eighty-nine thousand, eight hundred nine".