Alright, let's work through 9091 times 1581 step by step
9091 × 1581 = 1581 × (9091)
+ 1581 × 1 what gives us 1581
+ 1581 × 90 yielding 142290
+ 1581 × 000 what gives us 0
+ 1581 × 9000 what gives us 14229000

= 14372871
