Divisor 18209

To determine if any number is divisible by 18209, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 131 and 139 - then it is divisible by 18209.

The following tests must pass:

• Test if a number is divisible by 131
• Test if a number is divisible by 139

Easy!