1867

This number is a prime.

There are only 1867 different summing equalities for numbers 1 to 11 where no value is used more than once: 1 + 2 = 3, 1 + 3 = 4, 2 + 3 = 1 + 4, etc. [Noll]

Concatenating the prime number previous to 1867 with itself (i.e., 18611867) is prime. [Noll]

1867 = 284th prime + 284th composite: 1867 = 1559 + 308. [Noll]

1867 is the smallest prime that is the sum of 44 consecutive composite numbers: 1867 = 14 + 15 + 16 + 18 + 20 + ... + 68 + 69 + 70. [Noll]

In this emirp year of 1867, the Dominion of Canada was created by an act of the British Parliament. [Green]

The smallest prime that can be expressed as the sum of distinct Fibonacci numbers in 42 different ways. [Noll]

Phoenix, Arizona was founded in 1867 as an agricultural community. [Swilling]