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The Andromeda Galaxy (M31) is the Local Group galaxy that is most similar tothe Milky Way (MW). The similarities between the two galaxies make M31 usefulfor studying integrated properties common to spiral galaxies. We use the datafrom the recent QUIJOTE-MFI Wide Survey, together with new raster observationsfocused on M31, to study its integrated emission. The addition of raster dataimproves the sensitivity of QUIJOTE-MFI maps by almost a factor 3. Our maininterest is to confirm if anomalous microwave emission (AME) is present in M31,as previous studies have suggested. To do so, we built the integrated spectralenergy distribution of M31 between 0.408 and 3000 GHz. We then performed acomponent separation analysis taking into account synchrotron, free-free, AMEand thermal dust components. AME in M31 is modelled as a log-normaldistribution with maximum amplitude, $A_{\rm AME}$, equal to $1.03\pm0.32$ Jy.It peaks at $\nu_{\rm AME}=17.2\pm3.2$ GHz with a width of $W_{\rmAME}=0.58\pm0.16$. Both the Akaike and Bayesian Information Criteria find themodel without AME to be less than 1 % as probable as the one taking AME intoconsideration. We find that the AME emissivity per 100 $\mu$m intensity in M31is $\epsilon_{\rm AME}^{\rm 28.4\,GHz}=9.6\pm3.1$ $\mu$K/(MJy/sr), similar tothat computed for the MW. We also provide the first upper limits for the AMEpolarization fraction in an extragalactic object. M31 remains the only galaxywhere an AME measurement has been made of its integrated spectrum.

QUIJOTE Scientific Results -- XVII. Studying the Anomalous Microwave Emission in the Andromeda Galaxy with QUIJOTE-MFI