Divisor 17809

To determine if any number is divisible by 17809, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 11 and 1619 - then it is divisible by 17809.

The following tests must pass:

• Test if a number is divisible by 11
• The "Callum Porritt Test" for Divisibility by 1619

Easy!