2099309 has 2 divisors, whose sum is σ = 2099310. Its totient is φ = 2099308.

The previous prime is 2099299. The next prime is 2099327. The reversal of 2099309 is 9039902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464100 + 635209 = 1210^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099309 - 2²⁰ = 1050733 is a prime.

It is a Chen prime.

It is equal to p₁₅₅₇₅₉ and since 2099309 and 155759 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099359) 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 as a sum of consecutive naturals, namely, 1049654 + 1049655.

It is an arithmetic number, because the mean of its divisors is an integer number (1049655).

2^2099309 is an apocalyptic number.

It is an amenable number.

2099309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099309 is an equidigital number, since it uses as much as digits as its factorization.

2099309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 2099309 is about 1448.8992373523. The cubic root of 2099309 is about 128.0438692404.

The spelling of 2099309 in words is "two million, ninety-nine thousand, three hundred nine".