391616 divided by 31 
The aim is to understand the frequency of 31 in 391616.

Let's proceed to step 1:
The number 31 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 31

Step 2:
31 can be fit into 39 1 times, resulting in a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 31 away from 39, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 31

Advancing to step 3:
31 can be fit into 81 2 times, resulting in a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 62 from 81 leaves us with 19.
Take the next digit (6) from the dividend and append it to 19, then repeat: 196 / 31

Moving on to step 4:
If we divide 196 by 31, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 126.0
Subtracting 186 from 196 leaves us with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 31

Let's proceed to step 5:
31 goes into 101 3 times with a remainder of 8.
Put 3 as the next digit of the answer. 
Result so far: 1263.0
Subtract 93 from 101 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 31

Let's proceed to step 6:
31 goes into 86 2 times with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 12632.0
Subtract 62 from 86 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
If we divide 240 by 31, we get 7 and a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 12632.7
Deduct 217 from 240 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 8:
When dividing 230 by 31, we get 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 12632.77
The remainder is 13 after subtracting 217 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 12632.77 with a remainder of 0.013.