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 | one billion three hundred thirty-eight million thirty-two thousand six hundred nine |
---|

- 1338032609 has 4 divisors, whose sum is
**1338528516** - The reverse of 1338032609 is
**9062308331** - Previous prime number is
**2713**

- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 35
- Digital Root 8

Name | one billion six hundred forty-seven million three hundred fifty-eight thousand six hundred twenty-two |
---|

- 1647358622 has 32 divisors, whose sum is
**3123486912** - The reverse of 1647358622 is
**2268537461** - Previous prime number is
**37**

- Is Prime? no
- Number parity even
- Number length 10
- Sum of Digits 44
- Digital Root 8

Name | one billion fifty-five million three hundred forty-one thousand two hundred five |
---|

- 1055341205 has 8 divisors, whose sum is
**1267623000** - The reverse of 1055341205 is
**5021435501** - Previous prime number is
**1049**

- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 26
- Digital Root 8