get title of custom post type wordpress code example

Example 1: get post title by post id wordpress

get_post( $post_id )->post_title

Example 2: get name custom post type wordpress

$pt = get_post_type_object( 'books' );

// These two usually contain the post type name in plural. 
// They may differ though.
echo $pt->label;
echo $pt->labels->name;

// This one holds the post type name in singular.
echo $pt->labels->singular_name;