Rewrite <math><mstyle displaystyle="true"><mn>81</mn></mstyle></math> as <math><mstyle displaystyle="true"><msup><mrow><mn>9</mn></mrow><mrow><mn>2</mn></mrow></msup></mstyle></math> .

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

Rewrite the polynomial.

Factor using the perfect square trinomial rule <math><mstyle displaystyle="true"><msup><mrow><mi>a</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mn>2</mn><mi>a</mi><mi>b</mi><mo>+</mo><msup><mrow><mi>b</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><msup><mrow><mo>(</mo><mi>a</mi><mo>+</mo><mi>b</mi><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msup></mstyle></math> , where <math><mstyle displaystyle="true"><mi>a</mi><mo>=</mo><mi>x</mi></mstyle></math> and <math><mstyle displaystyle="true"><mi>b</mi><mo>=</mo><mn>9</mn></mstyle></math> .

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Name | three hundred fifty million six hundred forty-three thousand six hundred fifty-five |
---|

- 350643655 has 8 divisors, whose sum is
**422611200** - The reverse of 350643655 is
**556346053** - Previous prime number is
**229**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 37
- Digital Root 1

Name | nine hundred forty-eight million eight hundred ten thousand nine hundred ninety-three |
---|

- 948810993 has 16 divisors, whose sum is
**1362962496** - The reverse of 948810993 is
**399018849** - Previous prime number is
**3917**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 51
- Digital Root 6

Name | four hundred forty-eight million four hundred twenty-six thousand two |
---|

- 448426002 has 16 divisors, whose sum is
**897099840** - The reverse of 448426002 is
**200624844** - Previous prime number is
**4679**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 30
- Digital Root 3