8216609 has 2 divisors, whose sum is σ = 8216610. Its totient is φ = 8216608.

The previous prime is 8216603. The next prime is 8216641. The reversal of 8216609 is 9066128.

It is an a-pointer prime, because the next prime (8216641) can be obtained adding 8216609 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7006609 + 1210000 = 2647^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 8216609 - 2⁸ = 8216353 is a prime.

It is not a weakly prime, because it can be changed into another prime (8216603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108304 + 4108305.

It is an arithmetic number, because the mean of its divisors is an integer number (4108305).

Almost surely, 2^8216609 is an apocalyptic number.

It is an amenable number.

8216609 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216609 is an equidigital number, since it uses as much as digits as its factorization.

8216609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 8216609 is about 2866.4628028286. The cubic root of 8216609 is about 201.7890242449.

The spelling of 8216609 in words is "eight million, two hundred sixteen thousand, six hundred nine".