Group the first two terms and the last two terms.

Factor out the greatest common factor (GCF) from each group.

Factor the polynomial by factoring out the greatest common factor, <math><mstyle displaystyle="true"><mi>y</mi><mo>+</mo><mn>1</mn></mstyle></math> .

Rewrite <math><mstyle displaystyle="true"><mn>4</mn></mstyle></math> as <math><mstyle displaystyle="true"><msup><mrow><mn>2</mn></mrow><mrow><mn>2</mn></mrow></msup></mstyle></math> .

Since both terms are perfect squares, factor using the difference of squares formula, <math><mstyle displaystyle="true"><msup><mrow><mi>a</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>-</mo><msup><mrow><mi>b</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><mrow><mo>(</mo><mi>a</mi><mo>+</mo><mi>b</mi><mo>)</mo></mrow><mrow><mo>(</mo><mi>a</mi><mo>-</mo><mi>b</mi><mo>)</mo></mrow></mstyle></math> where <math><mstyle displaystyle="true"><mi>a</mi><mo>=</mo><mi>y</mi></mstyle></math> and <math><mstyle displaystyle="true"><mi>b</mi><mo>=</mo><mn>2</mn></mstyle></math> .

Remove unnecessary parentheses.

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Name | one hundred twenty-three million nine hundred eleven thousand fifty |
---|

- 123911050 has 8 divisors, whose sum is
**193301316** - The reverse of 123911050 is
**050119321** - Previous prime number is
**25**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 22
- Digital Root 4

Name | eight hundred twenty-one million two hundred twenty-four thousand four hundred seventy-nine |
---|

- 821224479 has 8 divisors, whose sum is
**1152595840** - The reverse of 821224479 is
**974422128** - Previous prime number is
**19**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 39
- Digital Root 3

Name | six hundred eighty-seven million three hundred eighty-seven thousand eight hundred forty-six |
---|

- 687387846 has 32 divisors, whose sum is
**1406211840** - The reverse of 687387846 is
**648783786** - Previous prime number is
**263**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 57
- Digital Root 3