319391 has 2 divisors, whose sum is σ = 319392. Its totient is φ = 319390.

The previous prime is 319387. The next prime is 319399. The reversal of 319391 is 193913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 319391 - 2² = 319387 is a prime.

It is a super-2 number, since 2×319391² = 204021221762, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 319391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159695 + 159696.

It is an arithmetic number, because the mean of its divisors is an integer number (159696).

2³¹⁹³⁹¹ is an apocalyptic number.

319391 is a deficient number, since it is larger than the sum of its proper divisors (1).

319391 is an equidigital number, since it uses as much as digits as its factorization.

319391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729, while the sum is 26.

The square root of 319391 is about 565.1468835621. The cubic root of 319391 is about 68.3556196723.

The spelling of 319391 in words is "three hundred nineteen thousand, three hundred ninety-one".