799569509 has 2 divisors, whose sum is σ = 799569510. Its totient is φ = 799569508.

The previous prime is 799569479. The next prime is 799569523. The reversal of 799569509 is 905965997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749116900 + 50452609 = 27370^2 + 7103^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-799569509 is a prime.

It is a super-2 number, since 2×799569509² = 1278622799445002162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (799569569) 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, 399784754 + 399784755.

It is an arithmetic number, because the mean of its divisors is an integer number (399784755).

Almost surely, 2^799569509 is an apocalyptic number.

It is an amenable number.

799569509 is a deficient number, since it is larger than the sum of its proper divisors (1).

799569509 is an equidigital number, since it uses as much as digits as its factorization.

799569509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6889050, while the sum is 59.

The square root of 799569509 is about 28276.6601457810. The cubic root of 799569509 is about 928.1512233277.

The spelling of 799569509 in words is "seven hundred ninety-nine million, five hundred sixty-nine thousand, five hundred nine".