This number is a prime.

+ A prime formed by concatenating the first four nonzero Fibonacci numbers in sequence. [Gupta]

+ All the residences in Primes Lane in Holton, Suffolk, England, have a prime postcode. Primes Lane leads southwards into the B1123 main road. [Croll]

+ 11/23 (November 23) is the only date containing the concatenation of two 2-digit primes that can be read as a prime number in either "month-day" or "day-month" format, i.e., 11/23 or 23/11. Note that Kinro Kansha no Hi (Labor-Thanksgiving Day) occurs on this date in Japan. [Kik]

+ The smallest zeroless prime showing three consecutive digits. [Silva]

+ The sums of the first digits, middle digits, last digits and all digits are the four single-digit primes. [Silva]

+ The smallest prime, concatenated from two double-digit primes p, q such that their concatenation in the other order, i.e., 2311, is also prime. [Loungrides]

+ The only prime less than a googol formed from the smallest double-digit prime, (11), following the procedure “each next digit or 2-digit number can be represented as the sum of its two previous digits.” [Loungrides]

+ "1123 Hard to Believe Facts" is a wonderful book packed from beginning to end with factual information on a variety of subjects. [Kostov]

(There are 10 curios for this number that have not yet been approved by an editor.)

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