2809749889 has 2 divisors, whose sum is σ = 2809749890. Its totient is φ = 2809749888.

The previous prime is 2809749871. The next prime is 2809749937. The reversal of 2809749889 is 9889479082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1669539600 + 1140210289 = 40860^2 + 33767^2 .

It is a cyclic number.

It is not a de Polignac number, because 2809749889 - 2⁹ = 2809749377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2809749889.

It is not a weakly prime, because it can be changed into another prime (2809749809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404874944 + 1404874945.

It is an arithmetic number, because the mean of its divisors is an integer number (1404874945).

Almost surely, 2^2809749889 is an apocalyptic number.

It is an amenable number.

2809749889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809749889 is an equidigital number, since it uses as much as digits as its factorization.

2809749889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20901888, while the sum is 64.

The square root of 2809749889 is about 53007.0739524453. The cubic root of 2809749889 is about 1411.0938126534.

The spelling of 2809749889 in words is "two billion, eight hundred nine million, seven hundred forty-nine thousand, eight hundred eighty-nine".