327221561 has 2 divisors, whose sum is σ = 327221562. Its totient is φ = 327221560.

The previous prime is 327221537. The next prime is 327221563. The reversal of 327221561 is 165122723.

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., 324180025 + 3041536 = 18005^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 327221561 - 2⁶ = 327221497 is a prime.

It is a Sophie Germain prime.

Together with 327221563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (327221563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163610780 + 163610781.

It is an arithmetic number, because the mean of its divisors is an integer number (163610781).

Almost surely, 2^327221561 is an apocalyptic number.

It is an amenable number.

327221561 is a deficient number, since it is larger than the sum of its proper divisors (1).

327221561 is an equidigital number, since it uses as much as digits as its factorization.

327221561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 327221561 is about 18089.2664583172. The cubic root of 327221561 is about 689.0974413556.

The spelling of 327221561 in words is "three hundred twenty-seven million, two hundred twenty-one thousand, five hundred sixty-one".