17889055109 has 2 divisors, whose sum is σ = 17889055110. Its totient is φ = 17889055108.

The previous prime is 17889055099. The next prime is 17889055127. The reversal of 17889055109 is 90155098871.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13439764900 + 4449290209 = 115930^2 + 66703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17889055109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17889055189) 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, 8944527554 + 8944527555.

It is an arithmetic number, because the mean of its divisors is an integer number (8944527555).

Almost surely, 2^17889055109 is an apocalyptic number.

It is an amenable number.

17889055109 is a deficient number, since it is larger than the sum of its proper divisors (1).

17889055109 is an equidigital number, since it uses as much as digits as its factorization.

17889055109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 53.

The spelling of 17889055109 in words is "seventeen billion, eight hundred eighty-nine million, fifty-five thousand, one hundred nine".