328547561 has 2 divisors, whose sum is σ = 328547562. Its totient is φ = 328547560.

The previous prime is 328547507. The next prime is 328547591. The reversal of 328547561 is 165745823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228947161 + 99600400 = 15131^2 + 9980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328547561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (328547501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164273780 + 164273781.

It is an arithmetic number, because the mean of its divisors is an integer number (164273781).

Almost surely, 2^328547561 is an apocalyptic number.

It is an amenable number.

328547561 is a deficient number, since it is larger than the sum of its proper divisors (1).

328547561 is an equidigital number, since it uses as much as digits as its factorization.

328547561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 328547561 is about 18125.8809716935. The cubic root of 328547561 is about 690.0269967733.

The spelling of 328547561 in words is "three hundred twenty-eight million, five hundred forty-seven thousand, five hundred sixty-one".