2099719991 has 4 divisors (see below), whose sum is σ = 2129293584. Its totient is φ = 2070146400.

The previous prime is 2099719981. The next prime is 2099720011. The reversal of 2099719991 is 1999179902.

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

It is a cyclic number.

It is not a de Polignac number, because 2099719991 - 2¹⁴ = 2099703607 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 (2099719981) 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, 14786690 + ... + 14786831.

It is an arithmetic number, because the mean of its divisors is an integer number (532323396).

Almost surely, 2^2099719991 is an apocalyptic number.

2099719991 is a deficient number, since it is larger than the sum of its proper divisors (29573593).

2099719991 is an equidigital number, since it uses as much as digits as its factorization.

2099719991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29573592.

The product of its (nonzero) digits is 826686, while the sum is 56.

The square root of 2099719991 is about 45822.7016990487. The cubic root of 2099719991 is about 1280.5222459987.

The spelling of 2099719991 in words is "two billion, ninety-nine million, seven hundred nineteen thousand, nine hundred ninety-one".