12171289 has 4 divisors (see below), whose sum is σ = 13107556. Its totient is φ = 11235024.

The previous prime is 12171283. The next prime is 12171307. The reversal of 12171289 is 98217121.

12171289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1334025 + 10837264 = 1155^2 + 3292^2 .

It is a cyclic number.

It is not a de Polignac number, because 12171289 - 2⁷ = 12171161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12171289.

It is not an unprimeable number, because it can be changed into a prime (12171283) 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, 468114 + ... + 468139.

It is an arithmetic number, because the mean of its divisors is an integer number (3276889).

Almost surely, 2^12171289 is an apocalyptic number.

It is an amenable number.

12171289 is a deficient number, since it is larger than the sum of its proper divisors (936267).

12171289 is an equidigital number, since it uses as much as digits as its factorization.

12171289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936266.

The product of its digits is 2016, while the sum is 31.

The square root of 12171289 is about 3488.7374507119. The cubic root of 12171289 is about 230.0270226599.

It can be divided in two parts, 121712 and 89, that added together give a square (121801 = 349²).

The spelling of 12171289 in words is "twelve million, one hundred seventy-one thousand, two hundred eighty-nine".