Alright, let's work through 1531 times 871 step by step
1531 × 871 = 871 × (1531)
+ 871 × 1 yielding 871
+ 871 × 30 that results in 26130
+ 871 × 500 producing 435500
+ 871 × 1000 yielding 871000

= 1333501
