328717561 has 2 divisors, whose sum is σ = 328717562. Its totient is φ = 328717560.

The previous prime is 328717547. The next prime is 328717573. The reversal of 328717561 is 165717823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328334400 + 383161 = 18120^2 + 619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328717561 is a prime.

It is not a weakly prime, because it can be changed into another prime (328717511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164358780 + 164358781.

It is an arithmetic number, because the mean of its divisors is an integer number (164358781).

Almost surely, 2^328717561 is an apocalyptic number.

It is an amenable number.

328717561 is a deficient number, since it is larger than the sum of its proper divisors (1).

328717561 is an equidigital number, since it uses as much as digits as its factorization.

328717561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 40.

The square root of 328717561 is about 18130.5697924803. The cubic root of 328717561 is about 690.1459895534.

The spelling of 328717561 in words is "three hundred twenty-eight million, seven hundred seventeen thousand, five hundred sixty-one".