1153

This number is a prime.

The smallest 4-digit prime p of the form 2^t*3^u + 1. [Russo]

The smallest emirp formed from the concatenation of two double-digit primes. [Loungrides]

The only known prime number whose reversal is a Wieferich prime. [Gudipati]

The Official Loch Ness Monster Register includes 1153 sightings (as of August 31, 2023). [Campbell]

The largest prime number that can be displayed on a 12-hour clock in hours and minutes (11:53). [Nie]

The smallest number whose first 3 multiples contain the digit "3":

1153 x 1 = 1153
1153 x 2 = 2306
1153 x 3 = 3459