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(Abridged) GRB 061122 is one of the brightest GRBs detected within INTEGRAL'sfield of view to date. The two gamma-ray detectors on INTEGRAL were used toinvestigate the spectral characteristics of GRB 061122. A search for linearpolarisation in the prompt emission was carried out using the SPI multipleevent data in the energy range 100 keV-1 MeV.  The prompt spectrum was best fit by a combination of a blackbody and apower--law model (the quasithermal model), with evidence for high energyemission continuing above 8 MeV. A pseudo-redshift value of pz = 0.95 +/- 0.18was determined using the spectral fit parameters. The isotropic energy at thispseudo-redshift is 8.5 x 10^{52} erg. The jet opening angle was estimated to besmaller than 2.8 deg or larger than 11.9 deg from the X-ray lightcurve. Anupper limit of 60% polarisation was determined for the prompt emission of GRB061122, using the multiple event data.  The high energy emission observed in the spectrum may be due to the reverseshock interacting with the GRB ejecta when it is decelerated by the circumburstmedium. This behaviour has been observed in a small fraction of GRBs to date,but is expected to be more commonly observed by the Fermi Gamma-ray SpaceTelescope. The conditions for polarisation are met if the jet opening angle isless than 2.8 deg, but further constraints on the level of polarisation are notpossible.

High energy emission and polarisation limits for the INTEGRAL burst GRB 061122