not possible, 6 is an even number and has no single whole number in the middle
If you mean I as one of the middle 2 letters: triple, thrice, stripe, crimes and smiles are some examples.
Some five letter words with L in the middle are:agletaglowailedallayalleyallotallowalloyatlasbaldybalmybalsabelaybelchbeliebellybelowbilgebulgebulkybullybylawcellociliacoliccoloncolordallydelaydelftdeltadelvedillydollyfalsefelonfilchfillyfilthfoliofollyfullygollyhalvehelixhellohillyidleriglooinlayinletisletjellyjollyjulepmelonmilkymolarmulchnylonphloxpilafpilotpolarpoliopolkapolyppulsepylonrallyrelaxrelayrelicrulersaladsalsasaltysalvesalvosilkysolarsolidsolvesulfasulkysullysylphtallytalontelextuliptulleuplitvaletvalidvalorvaluevalvewaltzwelshzilch
loyalroyal
Some six letter words with the fifth letter L are:ampuleargyleawhilebeholdbottlebubblecattlecirclecoupledangledociledwindleeasilyembalmexhalefeeblefemalefiddleheraldinsultlovelymuddleoccultrashlyresultrevoltribaldtumultunfoldvastly
Byplay.
cretin -a stupid person
celary
Some five letter words with L in the middle are:agletaglowailedallayalleyallotallowalloyatlasbaldybalmybalsabelaybelchbeliebellybelowbilgebulgebulkybullybylawcellociliacoliccoloncolordallydelaydelftdeltadelvedillydollyfalsefelonfilchfillyfilthfoliofollyfullygollyhalvehelixhellohillyidleriglooinlayinletisletjellyjollyjulepmelonmilkymolarmulchnylonphloxpilafpilotpolarpoliopolkapolyppulsepylonrallyrelaxrelayrelicrulersaladsalsasaltysalvesalvosilkysolarsolidsolvesulfasulkysullysylphtallytalontelextuliptulleuplitvaletvalidvalorvaluevalvewaltzwelshzilch
The middle consonant in the word "balloon" is the letter "l."
ceilingdealingendlessfeelinggutlesshaulinghealingidolizeinflateinflamemailingmisleadnailingpeelingrealityreplacereplantrepletesailingsheltersinlesssmilingsweltertailinguselesswitless
loyalroyal
cellar
Some six letter words with the fifth letter L are:ampuleargyleawhilebeholdbottlebubblecattlecirclecoupledangledociledwindleeasilyembalmexhalefeeblefemalefiddleheraldinsultlovelymuddleoccultrashlyresultrevoltribaldtumultunfoldvastly
Byplay.
leader
cretin -a stupid person
Mutual
Lentil.