1989116111 has 2 divisors, whose sum is σ = 1989116112. Its totient is φ = 1989116110.

The previous prime is 1989116089. The next prime is 1989116131. The reversal of 1989116111 is 1116119891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1116119891) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1119116861 and 1686119111.

It is a cyclic number.

It is not a de Polignac number, because 1989116111 - 2¹⁸ = 1988853967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989116131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994558055 + 994558056.

It is an arithmetic number, because the mean of its divisors is an integer number (994558056).

Almost surely, 2^1989116111 is an apocalyptic number.

1989116111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989116111 is an equidigital number, since it uses as much as digits as its factorization.

1989116111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 38.

The square root of 1989116111 is about 44599.5079681379. The cubic root of 1989116111 is about 1257.6314180326.

The spelling of 1989116111 in words is "one billion, nine hundred eighty-nine million, one hundred sixteen thousand, one hundred eleven".