wrong:

    p = f5 % 1000000000
    if p > 100000000 and is_prime(p):

correct:

    p = f5 % 1000000000
    if f5 > 1000000000 and is_prime(p):

This point is not reflected in the condition of the problem :(
It should be explicitly stated that the last 9 digits can contain leading zeros, but the number itself must be at least 9 digits

if they check only 9-digit prime, I successfully perform 11 tests (up to n = 20)

if I check 8-digit and 9-digit prime, I successfully complete 21 tests (up to n = 100)

If I check 7-digit prime also, then I do not carry out any successful test

Is there something missing in the problem statement? Or is the prime test wrong?

If no arguments are given, ball objects should instantiate with a "ball type" of "regular."

->

If no arguments are given, ball objects should instantiate with a "ball type" of "regular".

"regular" INSTEAD "regular."

1 = 89,
2 = 271,
3 = 325,
4 = 328,
5 = 1025,
6 = 1055,
7 = 1081,
8 = 1129,
9 = 1169

but in the test sq_cub_rev_prime(9) = 1129, why?
1025, 1055, 1081 also have the required properties