2099793781 has 2 divisors, whose sum is σ = 2099793782. Its totient is φ = 2099793780.

The previous prime is 2099793727. The next prime is 2099793793. The reversal of 2099793781 is 1873979902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2094526756 + 5267025 = 45766^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099793781 - 2⁷ = 2099793653 is a prime.

It is a super-2 number, since 2×2099793781² = 8818267845452551922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099793701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049896890 + 1049896891.

It is an arithmetic number, because the mean of its divisors is an integer number (1049896891).

Almost surely, 2^2099793781 is an apocalyptic number.

It is an amenable number.

2099793781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099793781 is an equidigital number, since it uses as much as digits as its factorization.

2099793781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 2099793781 is about 45823.5068605623. The cubic root of 2099793781 is about 1280.5372461939.

The spelling of 2099793781 in words is "two billion, ninety-nine million, seven hundred ninety-three thousand, seven hundred eighty-one".