319000991 has 4 divisors (see below), whose sum is σ = 322098192. Its totient is φ = 315903792.

The previous prime is 319000987. The next prime is 319001017. The reversal of 319000991 is 199000913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 319000991 - 2² = 319000987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319000931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548446 + ... + 1548651.

It is an arithmetic number, because the mean of its divisors is an integer number (80524548).

Almost surely, 2^319000991 is an apocalyptic number.

319000991 is a deficient number, since it is larger than the sum of its proper divisors (3097201).

319000991 is a wasteful number, since it uses less digits than its factorization.

319000991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097200.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 319000991 is about 17860.5988421441. The cubic root of 319000991 is about 683.2778527763.

The spelling of 319000991 in words is "three hundred nineteen million, nine hundred ninety-one", and thus it is an aban number.