akapellos on "user_register hook"

How to rewrite user_nicename after register?
this function doesnt work.

function get_new_nicename($user_id){
 wp_update_user( array ('user_nicename' => $user_id) ) ;
 }
 add_action('user_register','get_new_nicename',10);

i need to change nicename to ID

or maybe possible to check nicename like username?
get_user_by('nicename') bla bla