nth root

[Tim]

In PythonWin I'm running a program to find the 13th root (say) of millions
of hundred-digit numbers.  I'm using
    n = 13
    root = base**(1.0/n)
which correctly computes the root to a large number of decimal places, but
therefore takes a long time.  All I need is the integer component.  Is there
a quicker way?
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