12791809 has 4 divisors (see below), whose sum is σ = 13204480. Its totient is φ = 12379140.

The previous prime is 12791797. The next prime is 12791819. The reversal of 12791809 is 90819721.

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 cyclic number.

It is not a de Polignac number, because 12791809 - 2⁵ = 12791777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12791819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206289 + ... + 206350.

It is an arithmetic number, because the mean of its divisors is an integer number (3301120).

It is a Proth number, since it is equal to 3123 ⋅ 2¹² + 1 and 3123 < 2¹².

Almost surely, 2^12791809 is an apocalyptic number.

It is an amenable number.

12791809 is a deficient number, since it is larger than the sum of its proper divisors (412671).

12791809 is an equidigital number, since it uses as much as digits as its factorization.

12791809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412670.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12791809 is about 3576.5638537568. The cubic root of 12791809 is about 233.8715112655.

The spelling of 12791809 in words is "twelve million, seven hundred ninety-one thousand, eight hundred nine".