29, the highest Prime number. Prime numbers have only two factors. You get 29, your opponent gets 1.
The highest prime number on the board. Prime numbers have only two factors. You get the number, your opponent gets 1.
23
97
97
97
97
Supercell is the best since he is the first one to start playing
So-so. You get ten, your opponent gets eight. The best first move is the highest prime number.
47
The worst first move is 48.
If you are playing the factor game, the best move is usually the highest available prime number. Prime numbers have two factors. You get the number, your opponent gets 1.
There are thirty possible first moves. 29 is best, 23 is second best. No cheating required.