What does & in Python mean?

Good evening to everyone! Please tell me what the operator & amp; in Python means? (this is not connected with many).
for example, there is a code that calculates whether the user is an integrated number of deuces:

  n =  int  ( input  ())   if  n & amp; (n -  1 ):   print  ( '" this number is not a stove of the two' )   else :   print  ( is the number - the degree of deuces' )     
 which in the second line means  n & amp; (n-1) ?