The perfect square pairs:

144 and 441, 169 and 961, 14884 and 48841

and their respective roots:

12 and 21, 13 and 31, 122 and 221 are formed by the same digits but written in reverse order.

The mathematician Thébault has investigated the pairs that have this curious property. For example, you found the following pair:

1113^{2} = 1,238,769 and 3111^{2 }= 9.678.321