1 x 89, 89 x 1
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The two numbers -9 + √89 (≈ 0.434) and -9 - √89 (≈ -18.434)
89 is a prime number which is only divisible by itself and 1.
They are: 1*89*1 = 89
89 x 90 = 8010 which are two consecutive two digit numbers that equal 8010.
1 and 89, -1 and -89