1151

This number is a prime.

In the 13th century, Persian mathematician Kamal al-Din Abu'l Hasan Muhammad ibn al-Hasan al-Farisi used a number of lemmas including an application of the Sieve of Eratosthenes to show that 1151 is prime.

Western explorers discovered that the Molucca Islands (also called the Spice Islands) are the source of cloves.

Obtained from half the average of the two known Wieferich primes. [Gudipati]

The smallest number that is the sum of consecutive primes in four ways. [Gudipati]

The smallest emirp that can be expressed as sum of a prime and its reversal and as a square and its reversal, i.e., 1151=229+922=625+526. [Loungrides]

The smallest prime p such that p + next prime(p) is an integer with ten prime factors, repetitions counted, i.e., 1151 + 1153 = 2304 = 2^8*3^2. [Rivera]