Step 1: Divide the number into separate digits:
19107 => 1 9 1 0 7
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
1 to 9 = 8
9 to 1 = 8
1 to 0 = 1
0 to 7 = 7
7 to 1 = 6
Step 3: Combine the filters to a string:
8 8 1 7 6 = 88176