323581 has 2 divisors, whose sum is σ = 323582. Its totient is φ = 323580.

The previous prime is 323579. The next prime is 323591. The reversal of 323581 is 185323.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319225 + 4356 = 565^2 + 66^2 .

It is an emirp because it is prime and its reverse (185323) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 323581 - 2¹ = 323579 is a prime.

It is a super-2 number, since 2×323581² = 209409327122, which contains 22 as substring.

Together with 323579, it forms a pair of twin primes.

323581 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161790 + 161791.

It is an arithmetic number, because the mean of its divisors is an integer number (161791).

2³²³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

323581 is a deficient number, since it is larger than the sum of its proper divisors (1).

323581 is an equidigital number, since it uses as much as digits as its factorization.

323581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 323581 is about 568.8418057773. The cubic root of 323581 is about 68.6532346660.

The spelling of 323581 in words is "three hundred twenty-three thousand, five hundred eighty-one".