This number is a composite.

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p = 5*6*9*1 + 1 is the largest prime factor of 5691, and 5691 = p*(5+6+9+1). Note that 5691 is the only odd number with this property and also there exists only one even number with this property. [Firoozbakht]

Submitted: 2004-09-06 11:15:05;   Last Modified: 2008-01-30 17:28:00.
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