Full Idea
The way something is is given by the totality of its intrinsic properties.
Gist of Idea
Total intrinsic properties give us what a thing is
Source
David Lewis (Extrinsic Properties [1983], I)
Book Reference
Lewis,David: 'Papers in Metaphysics and Epistemology' [CUP 1999], p.112
A Reaction
No. Some properties are intrinsic but trivial. The 'important' ones fix the identity (if the identity is indeed 'fixed').