11918858489 has 2 divisors, whose sum is σ = 11918858490. Its totient is φ = 11918858488.

The previous prime is 11918858459. The next prime is 11918858513. The reversal of 11918858489 is 98485881911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11201047225 + 717811264 = 105835^2 + 26792^2 .

It is a cyclic number.

It is not a de Polignac number, because 11918858489 - 2¹² = 11918854393 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 (11918858449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5959429244 + 5959429245.

It is an arithmetic number, because the mean of its divisors is an integer number (5959429245).

Almost surely, 2^11918858489 is an apocalyptic number.

It is an amenable number.

11918858489 is a deficient number, since it is larger than the sum of its proper divisors (1).

11918858489 is an equidigital number, since it uses as much as digits as its factorization.

11918858489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 62.

The spelling of 11918858489 in words is "eleven billion, nine hundred eighteen million, eight hundred fifty-eight thousand, four hundred eighty-nine".