1913
This number is a prime.
The smallest prime p such that the next prime (1931) is a permutation of the digits of p. Andy Edwards introduced the name "Ormiston pairs" for these after his students at Ormiston College (in Queensland, Australia) manually inspected prime lists and found the first few cases. (An Ormiston k-tuple beginning with p is k consecutive primes each of whose digits are permutations of the digits of p.) [De Geest]
The number of letters in the chemical name for tryptophan synthetase A protein. [Byrne]
The square of 1913 and the square of its reverse have no
digits in common. Are there any higher emirp pairs with
this property? [Gaydos]
"The busy world, which does not hunt poets as collectors
hunt for curios." F. Harrison (Webster's Revised
Unabridged Dictionary, 1913)
The year in which mathematician Paul Erdős was born is an emirp. [Beedassy]
The first sedan-type automobile, a Hudson, went on display
at the 13th National Automobile Show in New York in the
emirp year 1913. [Green]
The smallest emirp such that 1913^2 +/- 90 are also emirps. [Bajpai]
The smallest Honaker prime (emirp) whose prime index is Sophie Germain prime. [Bajpai]
The smallest Honaker prime whose product of digits is a perfect cube (1*9*1*3=27=3^3). [Bajpai]
The only Honaker emirp concatenated from two double-digit
primes. [Loungrides]
The smaller of two consecutive primes whose product of
digits are equal and nonzero. [Gupta]
The difference between an emirp and its reverse is always divisible by 18. So is 3191 - 1913 = 71 * 18. But, 1913 is
the smallest emirp such that the difference is 18 times an emirp. [Poo Sung]
Rudolf Diesel of diesel engine fame died suspiciously at
sea in 1913. [Dillow]