12111989 has 2 divisors, whose sum is σ = 12111990. Its totient is φ = 12111988.

The previous prime is 12111929. The next prime is 12111991. The reversal of 12111989 is 98911121.

12111989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 5522500 = 2567^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111989 is a prime.

It is a super-3 number, since 3×12111989³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 12111991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055994 + 6055995.

It is an arithmetic number, because the mean of its divisors is an integer number (6055995).

Almost surely, 2^12111989 is an apocalyptic number.

It is an amenable number.

12111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111989 is an equidigital number, since it uses as much as digits as its factorization.

12111989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 32.

The square root of 12111989 is about 3480.2282971093. The cubic root of 12111989 is about 229.6528411060.

The spelling of 12111989 in words is "twelve million, one hundred eleven thousand, nine hundred eighty-nine".