8663209 has 2 divisors, whose sum is σ = 8663210. Its totient is φ = 8663208.

The previous prime is 8663153. The next prime is 8663261. The reversal of 8663209 is 9023668.

It is a happy number.

8663209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 107584 = 2925^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 8663209 - 2¹¹ = 8661161 is a prime.

It is not a weakly prime, because it can be changed into another prime (8663279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4331604 + 4331605.

It is an arithmetic number, because the mean of its divisors is an integer number (4331605).

Almost surely, 2^8663209 is an apocalyptic number.

It is an amenable number.

8663209 is a deficient number, since it is larger than the sum of its proper divisors (1).

8663209 is an equidigital number, since it uses as much as digits as its factorization.

8663209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 8663209 is about 2943.3329747074. The cubic root of 8663209 is about 205.3806846602.

The spelling of 8663209 in words is "eight million, six hundred sixty-three thousand, two hundred nine".