1159 = 19 x 61.
1159 is a centered octahedral number (A001845).
1159 is a member of the Mian-Chowla sequence (A005282).
1159 is the sum of the first 39 nonprimes (A051349).
1159 is the maximum number of points visible from some point in a square 43 x 43 lattice (A141224).
Source: What's Special About This Number?