12115689 has 4 divisors (see below), whose sum is σ = 16154256. Its totient is φ = 8077124.

The previous prime is 12115681. The next prime is 12115693. The reversal of 12115689 is 98651121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98651121 = 3 ⋅32883707.

It is a cyclic number.

It is not a de Polignac number, because 12115689 - 2³ = 12115681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12115681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019279 + ... + 2019284.

It is an arithmetic number, because the mean of its divisors is an integer number (4038564).

Almost surely, 2^12115689 is an apocalyptic number.

It is an amenable number.

12115689 is a deficient number, since it is larger than the sum of its proper divisors (4038567).

12115689 is an equidigital number, since it uses as much as digits as its factorization.

12115689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038566.

The product of its digits is 4320, while the sum is 33.

The square root of 12115689 is about 3480.7598308415. The cubic root of 12115689 is about 229.6762236956.

The spelling of 12115689 in words is "twelve million, one hundred fifteen thousand, six hundred eighty-nine".