This number is a composite.
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The only distinct-digit brilliant number, that can be represented as sum of four powers using all the prime digits as bases and all the composite digits as exponents, i.e., 2^9 + 3^8 + 5^4 + 7^6 = 125347 = 163 * 769. Note that the concatenation in order of its prime factors is also a brilliant number, i.e., 163769 = 389 * 421. [Loungrides]