12811889 has 2 divisors, whose sum is σ = 12811890. Its totient is φ = 12811888.

The previous prime is 12811873. The next prime is 12811907. The reversal of 12811889 is 98811821.

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., 10758400 + 2053489 = 3280^2 + 1433^2 .

It is a cyclic number.

It is not a de Polignac number, because 12811889 - 2⁴ = 12811873 is a prime.

It is a super-3 number, since 3×12811889³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12811189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6405944 + 6405945.

It is an arithmetic number, because the mean of its divisors is an integer number (6405945).

Almost surely, 2^12811889 is an apocalyptic number.

It is an amenable number.

12811889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12811889 is an equidigital number, since it uses as much as digits as its factorization.

12811889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 38.

The square root of 12811889 is about 3579.3699166194. The cubic root of 12811889 is about 233.9938209097.

The spelling of 12811889 in words is "twelve million, eight hundred eleven thousand, eight hundred eighty-nine".