Divisor 27981

To determine if any number is divisible by 27981, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 3109 - then it is divisible by 27981.

The following tests must pass:

• Test if a number is divisible by 9
• The "Stuart Orford Test" for Divisibility by 3109

Easy!