327661 has 2 divisors, whose sum is σ = 327662. Its totient is φ = 327660.

The previous prime is 327647. The next prime is 327667. The reversal of 327661 is 166723.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 152100 = 419^2 + 390^2 .

It is an emirp because it is prime and its reverse (166723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 327661 - 2⁵ = 327629 is a prime.

It is a zygodrome in base 8.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 327661.

It is not a weakly prime, because it can be changed into another prime (327667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163830 + 163831.

It is an arithmetic number, because the mean of its divisors is an integer number (163831).

2³²⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

327661 is a deficient number, since it is larger than the sum of its proper divisors (1).

327661 is an equidigital number, since it uses as much as digits as its factorization.

327661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 327661 is about 572.4168061823. The cubic root of 327661 is about 68.9405775599.

The spelling of 327661 in words is "three hundred twenty-seven thousand, six hundred sixty-one".