Step 1: Divide the number into separate digits:
98361 => 9 8 3 6 1
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
9 to 8 = 1
8 to 3 = 5
3 to 6 = 3
6 to 1 = 5
1 to 9 = 8
Step 3: Combine the filters to a string:
1 5 3 5 8 = 15358