326581 has 2 divisors, whose sum is σ = 326582. Its totient is φ = 326580.

The previous prime is 326567. The next prime is 326593. The reversal of 326581 is 185623.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 1681 = 570^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 326581 - 2⁵ = 326549 is a prime.

It is a super-2 number, since 2×326581² = 213310299122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (326561) 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 as a sum of consecutive naturals, namely, 163290 + 163291.

It is an arithmetic number, because the mean of its divisors is an integer number (163291).

2³²⁶⁵⁸¹ is an apocalyptic number.

It is an amenable number.

326581 is a deficient number, since it is larger than the sum of its proper divisors (1).

326581 is an equidigital number, since it uses as much as digits as its factorization.

326581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 326581 is about 571.4726590135. The cubic root of 326581 is about 68.8647494140.

The spelling of 326581 in words is "three hundred twenty-six thousand, five hundred eighty-one".