797509 has 2 divisors, whose sum is σ = 797510. Its totient is φ = 797508.

The previous prime is 797507. The next prime is 797539. The reversal of 797509 is 905797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 49284 = 865^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 797509 - 2¹ = 797507 is a prime.

Together with 797507, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (797507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398754 + 398755.

It is an arithmetic number, because the mean of its divisors is an integer number (398755).

2⁷⁹⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

797509 is a deficient number, since it is larger than the sum of its proper divisors (1).

797509 is an equidigital number, since it uses as much as digits as its factorization.

797509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 797509 is about 893.0335939930. The cubic root of 797509 is about 92.7353248457.

The spelling of 797509 in words is "seven hundred ninety-seven thousand, five hundred nine".