2189617889 has 2 divisors, whose sum is σ = 2189617890. Its totient is φ = 2189617888.

The previous prime is 2189617883. The next prime is 2189617951. The reversal of 2189617889 is 9887169812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2181637264 + 7980625 = 46708^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189617889 - 2⁴ = 2189617873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2189617883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094808944 + 1094808945.

It is an arithmetic number, because the mean of its divisors is an integer number (1094808945).

Almost surely, 2^2189617889 is an apocalyptic number.

It is an amenable number.

2189617889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189617889 is an equidigital number, since it uses as much as digits as its factorization.

2189617889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 59.

The square root of 2189617889 is about 46793.3530429269. The cubic root of 2189617889 is about 1298.5423284719.

The spelling of 2189617889 in words is "two billion, one hundred eighty-nine million, six hundred seventeen thousand, eight hundred eighty-nine".