Step 1: Divide the number into separate digits:
52179 => 5 2 1 7 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
5 to 2 = 3
2 to 1 = 1
1 to 7 = 6
7 to 9 = 2
9 to 5 = 4
Step 3: Combine the filters to a string:
3 1 6 2 4 = 31624