798417209 has 2 divisors, whose sum is σ = 798417210. Its totient is φ = 798417208.

The previous prime is 798417197. The next prime is 798417211. The reversal of 798417209 is 902714897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784000000 + 14417209 = 28000^2 + 3797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-798417209 is a prime.

Together with 798417211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (798417229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399208604 + 399208605.

It is an arithmetic number, because the mean of its divisors is an integer number (399208605).

Almost surely, 2^798417209 is an apocalyptic number.

It is an amenable number.

798417209 is a deficient number, since it is larger than the sum of its proper divisors (1).

798417209 is an equidigital number, since it uses as much as digits as its factorization.

798417209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 798417209 is about 28256.2773379651. The cubic root of 798417209 is about 927.7051404340.

The spelling of 798417209 in words is "seven hundred ninety-eight million, four hundred seventeen thousand, two hundred nine".