326561 has 2 divisors, whose sum is σ = 326562. Its totient is φ = 326560.

The previous prime is 326549. The next prime is 326563. The reversal of 326561 is 165623.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295936 + 30625 = 544^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 326561 - 2⁶ = 326497 is a prime.

Together with 326563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (326563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163280 + 163281.

It is an arithmetic number, because the mean of its divisors is an integer number (163281).

326561 is a Friedman number, since it can be written as 6^6*(5+2)-31, using all its digits and the basic arithmetic operations.

2³²⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

326561 is a deficient number, since it is larger than the sum of its proper divisors (1).

326561 is an equidigital number, since it uses as much as digits as its factorization.

326561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 23.

The square root of 326561 is about 571.4551600957. The cubic root of 326561 is about 68.8633436136.

The spelling of 326561 in words is "three hundred twenty-six thousand, five hundred sixty-one".