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Which is bigger, 111911^{19} or 191119^{11}?

111911^{19} is bigger: 111911^{19} = 6.11590 × 101910^{19} and 191119^{11} = 1.16490 × 101410^{14}.

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The curve ln x / x, which decides every comparison of a^b with b^a246810121416182022-0.10.10.20.30.4x = 11x = 19peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 11^19 against 19^11 is the same question as which of the two marked points is higher; the curve peaks at x = e.

How to work it out

  1. 1

    Compute both exactly: 111911^{19} = 61159090448414546291 and 191119^{11} = 116490258898219.

  2. 2

    So 111911^{19} is bigger.

  3. 3

    The reason: taking logs, aba^{b} against bab^{a} is the same as ln⁡aa\frac{\ln a}{a} against ln⁡bb\frac{\ln b}{b}. The function ln⁡xx\frac{\ln x}{x} rises until x=e≈2.718x = e \approx 2.718 and falls afterwards. Both 11 and 19 are past e, where the function is decreasing, so the larger exponent loses and 111911^{19} > 191119^{11}.

    ln⁡1111 > ln⁡1919\frac{\ln 11}{11}\ >\ \frac{\ln 19}{19}
LaTeX source of the formulas on this page
\[ 11^{19} = 6.11590\times 10^{19}\ >\ 19^{11} = 1.16490\times 10^{14} \]
\[ \frac{\ln 11}{11}\ >\ \frac{\ln 19}{19} \]

Questions

Which is bigger, 111911^{19} or 191119^{11}?

111911^{19} is bigger: 111911^{19} = 6.11590 × 101910^{19} and 191119^{11} = 1.16490 × 101410^{14}.

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