Properties of the Higgs boson are measured in the $\mathrm{H}\rightarrow{\rm Z}{\rm Z}\rightarrow4\ell$ ($\ell={\rm e},\mu$) decay channel. A data sample of proton-proton collisions at a center-of-mass energy of 13~\mathrm{TeV} is used, corresponding to an integrated luminosity of 41.5~\mathrm{fb}^{-1} recorded in 2017 by the CMS detector at the LHC. The signal-strength modifier $\mu$, defined as the ratio of the observed Higgs boson rate in the $\mathrm{H}\rightarrow{\rm Z}{\rm Z}\rightarrow4\ell$ decay channel to the standard model expectation, is measured to be $\mu=1.10^{+0.19}_{-0.17}$ at m_{\mathrm{H}}=125.09~\mathrm{GeV}, the combined ATLAS and CMS measurement of the Higgs boson mass. The signal-strength modifiers for the main Higgs boson production modes are also constrained. Combination with data recorded in 2016 by the CMS detector at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9~\mathrm{fb}^{-1} is reported. All results are found to be compatible with the standard model predictions.

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