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In this manuscript, we analyze the structural properties of $Z=119$superheavy nuclei in the mass range of 284 $\le$ A $\le$ 375 within theframework of axially deformed relativistic mean field theory (RMF) andcalculate the binding energy, radii, quadrupole deformation parameter,separation energies and density profile. To investigate the phenomenon of shapecoexistence the RMF calculations are performed within three possible solutionsi.e. prolate, oblate and spherical configurations. To get a bettervisualization of nucleon and total matter distribution, two-dimensional contourrepresentation of density distribution for $^{291}$119 and $^{303}$119 has beenmade. Further, a competition between possible decay modes such as$\alpha-$decay, $\beta-$decay and spontaneous fission (SF) of the isotopicchain of $Z=119$ superheavy nuclei under study is systematically analyzedwithin self-consistent relativistic mean field model.  Our analysis confirmed that $\alpha-$decay is restricted within the massrange 284 $\leq$ A $\leq$ 296 and thus being the dominant decay channel in thismass range. There is no possibility of $\beta-$decay for the consideredisotopic chain. In addition, we forecasted the $\alpha-$decay chain of fissionsurvival nuclides i.e. $^{284-296}$119 and found as one $\alpha$ chain from$^{284}$119 and $^{296}$119, two consistent $\alpha$ chains from $^{285}$119and $^{295}$119, three consistent $\alpha$ chains from $^{286}$119 and$^{294}$119, four consistent alpha chains from $^{287}$119, six consistentalpha chains from $^{288-293}$119. Thus, such studies can be of greatsignificance to the experimentalists in very near future for synthesizing$Z=119$ superheavy nuclei.

Theoretical studies on structural properties and decay modes of $^{284-375}$119 isotopes