A:
Positive:
1 x 1613134397 x 2304477719 x 849018149 x 3292111133 x 1212883163 x 989653931 x 1732691063 x 1517531141 x 1413793097 x 520877441 x 216797987 x 20197
Negative:
-1 x -161313439-7 x -23044777-19 x -8490181-49 x -3292111-133 x -1212883-163 x -989653-931 x -173269-1063 x -151753-1141 x -141379-3097 x -52087-7441 x -21679-7987 x -20197
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 161,313,439, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 161,313,439 | |
| -1 | -161,313,439 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 161,313,439.
Example:
1 x 161,313,439 = 161,313,439
and
-1 x -161,313,439 = 161,313,439
Notice both answers equal 161,313,439
With that explanation out of the way, let's continue. Next, we take the number 161,313,439 and divide it by 2:
161,313,439 ÷ 2 = 80,656,719.5
If the quotient is a whole number, then 2 and 80,656,719.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 161,313,439 | |
| -1 | -161,313,439 |
Now, we try dividing 161,313,439 by 3:
161,313,439 ÷ 3 = 53,771,146.3333
If the quotient is a whole number, then 3 and 53,771,146.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 161,313,439 | |
| -1 | -161,313,439 |
Let's try dividing by 4:
161,313,439 ÷ 4 = 40,328,359.75
If the quotient is a whole number, then 4 and 40,328,359.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 161,313,439 | |
| -1 | 161,313,439 |
If you did it right, you will end up with this table:
| 1 | 7 | 19 | 49 | 133 | 163 | 931 | 1,063 | 1,141 | 3,097 | 7,441 | 7,987 | 20,197 | 21,679 | 52,087 | 141,379 | 151,753 | 173,269 | 989,653 | 1,212,883 | 3,292,111 | 8,490,181 | 23,044,777 | 161,313,439 |
| -1 | -7 | -19 | -49 | -133 | -163 | -931 | -1,063 | -1,141 | -3,097 | -7,441 | -7,987 | -20,197 | -21,679 | -52,087 | -141,379 | -151,753 | -173,269 | -989,653 | -1,212,883 | -3,292,111 | -8,490,181 | -23,044,777 | -161,313,439 |
Here are some more numbers to try:
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