2099779901 has 2 divisors, whose sum is σ = 2099779902. Its totient is φ = 2099779900.

The previous prime is 2099779883. The next prime is 2099779909. The reversal of 2099779901 is 1099779902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2035363225 + 64416676 = 45115^2 + 8026^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2099779901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099779909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049889950 + 1049889951.

It is an arithmetic number, because the mean of its divisors is an integer number (1049889951).

Almost surely, 2^2099779901 is an apocalyptic number.

It is an amenable number.

2099779901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099779901 is an equidigital number, since it uses as much as digits as its factorization.

2099779901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 642978, while the sum is 53.

The square root of 2099779901 is about 45823.3554096598. The cubic root of 2099779901 is about 1280.5344246635.

Subtracting from 2099779901 its reverse (1099779902), we obtain a palindrome (999999999).

The spelling of 2099779901 in words is "two billion, ninety-nine million, seven hundred seventy-nine thousand, nine hundred one".