12917189 has 4 divisors (see below), whose sum is σ = 12950124. Its totient is φ = 12884256.

The previous prime is 12917183. The next prime is 12917221. The reversal of 12917189 is 98171921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98171921 = 857 ⋅114553.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 9872164 = 1745^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 12917189 - 2²⁰ = 11868613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15872 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (3237531).

Almost surely, 2^12917189 is an apocalyptic number.

It is an amenable number.

12917189 is a deficient number, since it is larger than the sum of its proper divisors (32935).

12917189 is an equidigital number, since it uses as much as digits as its factorization.

12917189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32934.

The product of its digits is 9072, while the sum is 38.

The square root of 12917189 is about 3594.0491092916. The cubic root of 12917189 is about 234.6331321079.

The spelling of 12917189 in words is "twelve million, nine hundred seventeen thousand, one hundred eighty-nine".