2791

This number is a prime.

Bobby Fischer won the US Championship in chess in the 1957/58 season when he was just 14 years old. He won the World Championship in chess in 1972 when he was just 29 years old. Consider those two numbers, 14 and 29. 14 multiplied by 29 equals 406. The 406th prime number is 2791. Reverse the digits of that number and one obtains 1972, the year Fischer won the World Championship. [O'Shea]