798505817 has 2 divisors, whose sum is σ = 798505818. Its totient is φ = 798505816.

The previous prime is 798505811. The next prime is 798505819. The reversal of 798505817 is 718505897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497691481 + 300814336 = 22309^2 + 17344^2 .

It is a cyclic number.

It is not a de Polignac number, because 798505817 - 2⁴ = 798505801 is a prime.

It is a super-2 number, since 2×798505817² = 1275223079565674978, which contains 22 as substring.

Together with 798505819, 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 (798505811) 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, 399252908 + 399252909.

It is an arithmetic number, because the mean of its divisors is an integer number (399252909).

Almost surely, 2^798505817 is an apocalyptic number.

It is an amenable number.

798505817 is a deficient number, since it is larger than the sum of its proper divisors (1).

798505817 is an equidigital number, since it uses as much as digits as its factorization.

798505817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 50.

The square root of 798505817 is about 28257.8452292456. The cubic root of 798505817 is about 927.7394579377.

The spelling of 798505817 in words is "seven hundred ninety-eight million, five hundred five thousand, eight hundred seventeen".