1447

This number is a prime.

Earliest case whereby a prime p divides the concatenation of prevprm(p), (p) and nextprm(p) or 143914471451 which is equal to 1447 * 99457133. [De Geest]

The smallest straight-digit prime that contains each of the straight digits (1, 4, and 7). [Gupta]

The smallest prime that is pandigital in Roman numerals, i.e., using each of the symbols I, V, X, L, C, D, and M at least once. [Post]

The very first literary work (titled "Yongbi och'on ka") to have used the present Korean alphabet was written in 1447. Reference: Cho D.I., Bouchez D. (2002) Histoire de la littérature coréenne. Fayard, p. 154. [Olry]

The number of delegates required by GOP rules to vote for Trump at the convention.

Smallest 4-digit prime where none of its permutations is a prime. [Rex]

The smallest prime p such that 4p+3, 16p+15, 64p+63, and 256p+255 are also primes. [Ahmed]