No problem, we've got 8131 and 8591 to multiply
8131 × 8591 = 8591 × (8131)
+ 8591 × 1 which equals 8591
+ 8591 × 30 giving us 257730
+ 8591 × 100 giving us 859100
+ 8591 × 8000 what gives us 68728000

= 69853421
