2144889809 has 2 divisors, whose sum is σ = 2144889810. Its totient is φ = 2144889808.

The previous prime is 2144889749. The next prime is 2144889823. The reversal of 2144889809 is 9089884412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2132130625 + 12759184 = 46175^2 + 3572^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144889809 - 2⁸ = 2144889553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2144889829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072444904 + 1072444905.

It is an arithmetic number, because the mean of its divisors is an integer number (1072444905).

Almost surely, 2^2144889809 is an apocalyptic number.

It is an amenable number.

2144889809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144889809 is an equidigital number, since it uses as much as digits as its factorization.

2144889809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The square root of 2144889809 is about 46312.9550881824. The cubic root of 2144889809 is about 1289.6395060629.

The spelling of 2144889809 in words is "two billion, one hundred forty-four million, eight hundred eighty-nine thousand, eight hundred nine".