2099719981 has 2 divisors, whose sum is σ = 2099719982. Its totient is φ = 2099719980.

The previous prime is 2099719967. The next prime is 2099720011. The reversal of 2099719981 is 1899179902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115894025 + 983825956 = 33405^2 + 31366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099719981 - 2²¹ = 2097622829 is a prime.

It is a super-5 number, since 5×2099719981⁵ (a number of 48 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099719481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049859990 + 1049859991.

It is an arithmetic number, because the mean of its divisors is an integer number (1049859991).

Almost surely, 2^2099719981 is an apocalyptic number.

It is an amenable number.

2099719981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099719981 is an equidigital number, since it uses as much as digits as its factorization.

2099719981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 55.

The square root of 2099719981 is about 45822.7015899325. The cubic root of 2099719981 is about 1280.5222439658.

The spelling of 2099719981 in words is "two billion, ninety-nine million, seven hundred nineteen thousand, nine hundred eighty-one".