1159

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?