Are BITAND & BIT_AND functions - DETERMINISTIC functions ?

I've a following function in my system.

FUNCTION bit_and ( Num1 IN NUMBER, Num2 IN NUMBER )
RETURN NUMBER
IS
v_digit number := 32;
Mul_Factor number;
v_Bit_And number;
begin
Mul_Factor := power(2, v_Digit);

if Num1 is null or Num2 is null then
return null;
end if;

if Num1 = 0 or Num2 = 0 then
return 0;
end if;

IF Num1 < Mul_factor and Num2 < Mul_Factor Then
return BITAND ( Num1, Num2 );
else
v_bit_and := BITAND ( mod(Num1, Mul_Factor), mod(Num2, Mul_Factor) );
return Mul_factor * bit_and(trunc(Num1/Mul_factor), trunc(Num2/Mul_factor)) + v_bit_and ;
end if;
END bit_and;

I'm planning to make it a Deterministic function. Is this a good candidate for a Deterministic function.

Thanks

SQL> declare
  2    x number;
  3    y number;
  4    b number;
  5  begin
  6    x := power(2,40);
  7    y := power(2,45);
  8
  9    b := bitand(x,y);
 10  end;
 11  /

PL/SQL procedure successfully completed.