945

This number is a composite.

The smallest odd abundant number (945) is also the smallest odd k for which 4x^2 - 3x + 1, where x = k*2^3300 is prime (a proven prime of 1994 digits). This polynomial traces the horizontal ray of the Ulam spiral that starts 1, 2, 11, 28, 53, ... . [Yoldas]