791669509 has 2 divisors, whose sum is σ = 791669510. Its totient is φ = 791669508.

The previous prime is 791669503. The next prime is 791669513. The reversal of 791669509 is 905966197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765628900 + 26040609 = 27670^2 + 5103^2 .

It is an emirp because it is prime and its reverse (905966197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 791669509 - 2²⁵ = 758115077 is a prime.

It is a super-2 number, since 2×791669509² = 1253481222960602162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791669503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395834754 + 395834755.

It is an arithmetic number, because the mean of its divisors is an integer number (395834755).

Almost surely, 2^791669509 is an apocalyptic number.

It is an amenable number.

791669509 is a deficient number, since it is larger than the sum of its proper divisors (1).

791669509 is an equidigital number, since it uses as much as digits as its factorization.

791669509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 791669509 is about 28136.6222031004. The cubic root of 791669509 is about 925.0842909309.

The spelling of 791669509 in words is "seven hundred ninety-one million, six hundred sixty-nine thousand, five hundred nine".