Hard to remember Word and Number?

Word?
Try this for instances Nemesis
Backward it: sisemeN

Try this for instances Nefarious
Backward it: souirafeN


Number?
Two digit number:
29
Try to convert it to word, for i.e: 29 is RG or ZG

Three digit number:
781
Try to covert it to word, for i.e: 781 is TBI