Get Title and ID of CartoDB-Visualizations

How can I get the ID and Title of my CartoDB-Visualization via viz.json

  $mapVis = cartodb.createVis('map', http://[username].cartodb.com/api/v2/viz/[id]/viz.json, visOptionsM);
  $mapVis.on('done', function(vis, layers) {
    // how to get ID and Title here?
  }