1081 = 23 x 47.
1081 is the 46th triangular number (the sum of the first 46 integers) (A000217 and A068443). It is also a centered nonagonal number (A060544).
1081 is a member of the Padovan sequence (A000931).
1081 is a concentric dodecagonal number (A195143).
1081 is the sum of 11 consecutive primes (A127338).
1081 is the smallest semiprime and brilliant number that is prime when reversed and turned upside down.
1081 divides 932 - 1.
Source: Prime Curios!