Getting the site owner for SharePoint online site collection

Hi ,

I am trying to find the site owner here is my code,

 $(document).ready(function () {
ExecuteOrDelayUntilScriptLoaded(retrieveWebSite,"sp.js");
    });

function retrieveWebSite() {
    var clientContext = new SP.ClientContext.get_current();
	    oSite = clientContext.get_site();
   	oWebsite = clientContext.get_web();
    clientContext.load(oSite);
    clientContext.load(oWebsite);
    clientContext.executeQueryAsync(
        Function.createDelegate(this, this.onQuerySucceeded1),
        Function.createDelegate(this, this.onQueryFailed1)
    );
}

function onQuerySucceeded1(sender, args) {
var htmlString = "Site Owner: " + oSite.get_owner.name;
$("div.Details").html(htmlString);
}

function onQueryFailed1(sender, args) {
    alert('Request failed. ' + args.get_message() +
        '\n' + args.get_stackTrace());
}

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