def intToBinaryString(integer : int) -> str:
    """Convert an integer to a string representing a big endian binary number

    Parameters
    ----------
    integer : int
        A positive integer

    Returns
    -------
    str
        A string representing a big endian binary number
    """
    rtn = ""
    while integer > 0:
        rtn += str(integer % 2)
        integer = integer // 2

    return rtn[::-1]