816716609 has 2 divisors, whose sum is σ = 816716610. Its totient is φ = 816716608.

The previous prime is 816716471. The next prime is 816716629. The reversal of 816716609 is 906617618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771450625 + 45265984 = 27775^2 + 6728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816716609 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816716609.

It is not a weakly prime, because it can be changed into another prime (816716629) 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, 408358304 + 408358305.

It is an arithmetic number, because the mean of its divisors is an integer number (408358305).

Almost surely, 2^816716609 is an apocalyptic number.

It is an amenable number.

816716609 is a deficient number, since it is larger than the sum of its proper divisors (1).

816716609 is an equidigital number, since it uses as much as digits as its factorization.

816716609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 816716609 is about 28578.2541279204. The cubic root of 816716609 is about 934.7392140664.

The spelling of 816716609 in words is "eight hundred sixteen million, seven hundred sixteen thousand, six hundred nine".