.We study a collection of self-propelled apolar particles of different asymmetry on a two-dimensional substrate. Particle asymmetry is defined by different hopping probabilities along the long and short axes of the particle. Hopping probabilities p or s = 2p − 1 are introduced in such a way that p = 1/2 or s = 0.0 are spherically symmetric particles and p = 1 or s = 1.0 are elongated rod type particles. Number fluctuation for different hopping probabilities p is calculated analytically. Number fluctuation changes with the equilibrium limit for s = 0.0 to far from the equilibrium limit ΔN ≃ Na, a > 0.5 for non zero s. We calculate the density structure factor and number fluctuation numerically by solving nonlinear partial differential equations of motion for density and nematic order parameters. For small wave vector q, the structure factor diverges as and the corresponding number fluctuation for nonzero s.