2809661819 has 2 divisors, whose sum is σ = 2809661820. Its totient is φ = 2809661818.

The previous prime is 2809661797. The next prime is 2809661837. The reversal of 2809661819 is 9181669082.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2809661819 - 2¹² = 2809657723 is a prime.

It is a super-2 number, since 2×2809661819² = 15788399074292777522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2809661849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404830909 + 1404830910.

It is an arithmetic number, because the mean of its divisors is an integer number (1404830910).

Almost surely, 2^2809661819 is an apocalyptic number.

2809661819 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809661819 is an equidigital number, since it uses as much as digits as its factorization.

2809661819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 2809661819 is about 53006.2432077581. The cubic root of 2809661819 is about 1411.0790691904.

The spelling of 2809661819 in words is "two billion, eight hundred nine million, six hundred sixty-one thousand, eight hundred nineteen".