The properties of a Higgs boson candidate are measured in the $H \to ZZ \to 4l$ decay channel, with $l=e,\mu$, using data from pp collisions corresponding to an integrated luminosity of 5.1 inverse femtobarns at center-of-mass energy of $\sqrt{s}$=7 TeV and 19.7 inverse femtobarns at $\sqrt{s}$=8 TeV, recorded with the CMS detector at the LHC. The new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6$\pm$0.4 (stat.) $\pm$0.2 (syst.) GeV, and a total width less than 3.4 GeV at a 95% confidence level. The production cross section of the new boson times the branching fraction to four leptons is measured to be $0.93^{+0.26}_{-0.23} (stat.)^{+0.13}_{-0.09}$ (syst.) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the standard model Higgs boson. The hypotheses of a pseudoscalar and all tested spin-one boson hypotheses are excluded at a 99% confidence level or higher. All tested spin-two boson hypotheses are excluded at a 95% confidence level or higher.

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