Divisor 13173

To determine if any number is divisible by 13173, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 4391 - then it is divisible by 13173.

The following tests must pass:

• Test if a number is divisible by 3
• The "Aleix Ruiz de Villa Test" for Divisibility by 4391

Easy!