2168339809 has 4 divisors (see below), whose sum is σ = 2169254404. Its totient is φ = 2167425216.

The previous prime is 2168339791. The next prime is 2168339819. The reversal of 2168339809 is 9089338612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1022720400 + 1145619409 = 31980^2 + 33847^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168339809 - 2⁹ = 2168339297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168339819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453732 + ... + 458485.

It is an arithmetic number, because the mean of its divisors is an integer number (542313601).

Almost surely, 2^2168339809 is an apocalyptic number.

It is an amenable number.

2168339809 is a deficient number, since it is larger than the sum of its proper divisors (914595).

2168339809 is an equidigital number, since it uses as much as digits as its factorization.

2168339809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914594.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 2168339809 is about 46565.4357759057. The cubic root of 2168339809 is about 1294.3223416941.

The spelling of 2168339809 in words is "two billion, one hundred sixty-eight million, three hundred thirty-nine thousand, eight hundred nine".