This number is a prime.
The only prime in the following alphametic:
UK USA + USSR -------- ABOMB.[Madachy]
The largest prime containing only odd digits, in decreasing order. [Hasler]
The largest prime (emirp) formed from the complementary digits of the single-digit powers of 3, (3^0=1, 3^1=3, 3^2=9), i.e., 9, 7, 1. [Loungrides]
King Solomon's reign began circa 971 BCE. [Jewish Encyclopedia]
Joseph Asscher of Amsterdam gained fame for cutting the famous 971 carat Excelsior rough diamond. [Haynes]