12111289 has 4 divisors (see below), whose sum is σ = 12369024. Its totient is φ = 11853556.

The previous prime is 12111287. The next prime is 12111301. The reversal of 12111289 is 98211121.

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: 98211121 = 1361 ⋅72161.

It is a cyclic number.

It is not a de Polignac number, because 12111289 - 2¹ = 12111287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111287) 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, 128797 + ... + 128890.

It is an arithmetic number, because the mean of its divisors is an integer number (3092256).

Almost surely, 2^12111289 is an apocalyptic number.

It is an amenable number.

12111289 is a deficient number, since it is larger than the sum of its proper divisors (257735).

12111289 is an equidigital number, since it uses as much as digits as its factorization.

12111289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257734.

The product of its digits is 288, while the sum is 25.

The square root of 12111289 is about 3480.1277275410. The cubic root of 12111289 is about 229.6484168372.

It can be divided in two parts, 1211 and 1289, that added together give a square (2500 = 50²).

The spelling of 12111289 in words is "twelve million, one hundred eleven thousand, two hundred eighty-nine".