791320409 has 4 divisors (see below), whose sum is σ = 863258640. Its totient is φ = 719382180.

The previous prime is 791320399. The next prime is 791320429. The reversal of 791320409 is 904023197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-791320409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (791320429) 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 in 3 ways as a sum of consecutive naturals, for example, 35969099 + ... + 35969120.

It is an arithmetic number, because the mean of its divisors is an integer number (215814660).

Almost surely, 2^791320409 is an apocalyptic number.

It is an amenable number.

791320409 is a deficient number, since it is larger than the sum of its proper divisors (71938231).

791320409 is a wasteful number, since it uses less digits than its factorization.

791320409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71938230.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 791320409 is about 28130.4178603874. The cubic root of 791320409 is about 924.9482937740.

The spelling of 791320409 in words is "seven hundred ninety-one million, three hundred twenty thousand, four hundred nine".