2099990309 has 4 divisors (see below), whose sum is σ = 2100108300. Its totient is φ = 2099872320.

The previous prime is 2099990287. The next prime is 2099990323. The reversal of 2099990309 is 9030999902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1012639684 + 1087350625 = 31822^2 + 32975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2099990309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099990609) 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, 26234 + ... + 69915.

It is an arithmetic number, because the mean of its divisors is an integer number (525027075).

Almost surely, 2^2099990309 is an apocalyptic number.

It is an amenable number.

2099990309 is a deficient number, since it is larger than the sum of its proper divisors (117991).

2099990309 is an equidigital number, since it uses as much as digits as its factorization.

2099990309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117990.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 2099990309 is about 45825.6512119577. The cubic root of 2099990309 is about 1280.5771951285.

The spelling of 2099990309 in words is "two billion, ninety-nine million, nine hundred ninety thousand, three hundred nine".