8643011609 has 2 divisors, whose sum is σ = 8643011610. Its totient is φ = 8643011608.

The previous prime is 8643011501. The next prime is 8643011711. The reversal of 8643011609 is 9061103468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6457729600 + 2185282009 = 80360^2 + 46747^2 .

It is a cyclic number.

It is not a de Polignac number, because 8643011609 - 2³² = 4348044313 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 (8643011009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321505804 + 4321505805.

It is an arithmetic number, because the mean of its divisors is an integer number (4321505805).

Almost surely, 2^8643011609 is an apocalyptic number.

It is an amenable number.

8643011609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643011609 is an equidigital number, since it uses as much as digits as its factorization.

8643011609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 8643011609 is about 92967.7987746295. The cubic root of 8643011609 is about 2052.2095240084.

The spelling of 8643011609 in words is "eight billion, six hundred forty-three million, eleven thousand, six hundred nine".