327581 has 2 divisors, whose sum is σ = 327582. Its totient is φ = 327580.

The previous prime is 327571. The next prime is 327583. The reversal of 327581 is 185723.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320356 + 7225 = 566^2 + 85^2 .

It is an emirp because it is prime and its reverse (185723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 327581 - 2⁶ = 327517 is a prime.

It is a super-2 number, since 2×327581² = 214618623122, which contains 22 as substring.

Together with 327583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 327581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (327583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163790 + 163791.

It is an arithmetic number, because the mean of its divisors is an integer number (163791).

2³²⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

327581 is a deficient number, since it is larger than the sum of its proper divisors (1).

327581 is an equidigital number, since it uses as much as digits as its factorization.

327581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 327581 is about 572.3469227663. The cubic root of 327581 is about 68.9349663793.

The spelling of 327581 in words is "three hundred twenty-seven thousand, five hundred eighty-one".