8205422609 has 2 divisors, whose sum is σ = 8205422610. Its totient is φ = 8205422608.

The previous prime is 8205422513. The next prime is 8205422647. The reversal of 8205422609 is 9062245028.

It is an a-pointer prime, because the next prime (8205422647) can be obtained adding 8205422609 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4454227600 + 3751195009 = 66740^2 + 61247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8205422609 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 (8205422509) 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, 4102711304 + 4102711305.

It is an arithmetic number, because the mean of its divisors is an integer number (4102711305).

Almost surely, 2^8205422609 is an apocalyptic number.

It is an amenable number.

8205422609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8205422609 is an equidigital number, since it uses as much as digits as its factorization.

8205422609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 8205422609 is about 90583.7877823620. The cubic root of 8205422609 is about 2016.9740834485.

The spelling of 8205422609 in words is "eight billion, two hundred five million, four hundred twenty-two thousand, six hundred nine".