nteger, -1e+6 to 1e+6 inclusive
    </p>
    <p>
      Returns a BigNumber whose value is the value of this BigNumber raised to
      the power <code>exp</code>.
    </p>
    <p>
      If <code>exp</code> is negative the result is rounded according to the
      current <a href='#decimal-places'><code>DECIMAL_PLACES</code></a> and
      <a href='#rounding-mode'><code>ROUNDING_MODE</code></a> settings.
    </p>
    <p>
      If <code>exp</code> is not an integer or is out of range:
    </p>
    <p class='inse