319899891 has 16 divisors (see below), whose sum is σ = 446334624. Its totient is φ = 203583744.

The previous prime is 319899869. The next prime is 319899901. The reversal of 319899891 is 198998913.

It is not a de Polignac number, because 319899891 - 2⁵ = 319899859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (319899851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21306 + ... + 33071.

It is an arithmetic number, because the mean of its divisors is an integer number (27895914).

Almost surely, 2^319899891 is an apocalyptic number.

319899891 is a deficient number, since it is larger than the sum of its proper divisors (126434733).

319899891 is a wasteful number, since it uses less digits than its factorization.

319899891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54470.

The product of its digits is 1259712, while the sum is 57.

The square root of 319899891 is about 17885.7454695073. The cubic root of 319899891 is about 683.9190445722.

The spelling of 319899891 in words is "three hundred nineteen million, eight hundred ninety-nine thousand, eight hundred ninety-one".