320591 has 2 divisors, whose sum is σ = 320592. Its totient is φ = 320590.

The previous prime is 320563. The next prime is 320609. The reversal of 320591 is 195023.

It is a strong prime.

It is an emirp because it is prime and its reverse (195023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320591 - 2¹⁰ = 319567 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320591.

It is not a weakly prime, because it can be changed into another prime (320521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160295 + 160296.

It is an arithmetic number, because the mean of its divisors is an integer number (160296).

2³²⁰⁵⁹¹ is an apocalyptic number.

320591 is a deficient number, since it is larger than the sum of its proper divisors (1).

320591 is an equidigital number, since it uses as much as digits as its factorization.

320591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 320591 is about 566.2075591159. The cubic root of 320591 is about 68.4411201285.

The spelling of 320591 in words is "three hundred twenty thousand, five hundred ninety-one".