A:
Positive:
1 x 2513665217 x 3590950349 x 512992973 x 3443377343 x 732847511 x 4919113577 x 7027310039 x 25039
Negative:
-1 x -251366521-7 x -35909503-49 x -5129929-73 x -3443377-343 x -732847-511 x -491911-3577 x -70273-10039 x -25039
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 251,366,521, 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 | 251,366,521 | |
| -1 | -251,366,521 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 251,366,521.
Example:
1 x 251,366,521 = 251,366,521
and
-1 x -251,366,521 = 251,366,521
Notice both answers equal 251,366,521
With that explanation out of the way, let's continue. Next, we take the number 251,366,521 and divide it by 2:
251,366,521 ÷ 2 = 125,683,260.5
If the quotient is a whole number, then 2 and 125,683,260.5 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 | 251,366,521 | |
| -1 | -251,366,521 |
Now, we try dividing 251,366,521 by 3:
251,366,521 ÷ 3 = 83,788,840.3333
If the quotient is a whole number, then 3 and 83,788,840.3333 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 | 251,366,521 | |
| -1 | -251,366,521 |
Let's try dividing by 4:
251,366,521 ÷ 4 = 62,841,630.25
If the quotient is a whole number, then 4 and 62,841,630.25 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 | 251,366,521 | |
| -1 | 251,366,521 |
If you did it right, you will end up with this table:
| 1 | 7 | 49 | 73 | 343 | 511 | 3,577 | 10,039 | 25,039 | 70,273 | 491,911 | 732,847 | 3,443,377 | 5,129,929 | 35,909,503 | 251,366,521 |
| -1 | -7 | -49 | -73 | -343 | -511 | -3,577 | -10,039 | -25,039 | -70,273 | -491,911 | -732,847 | -3,443,377 | -5,129,929 | -35,909,503 | -251,366,521 |
Here are some more numbers to try:
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