This number is a prime.
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The largest prime with distinct digits in French alphabetical order (Cinq, Huit, Neuf, Quatre, Sept, Six, Trois, Un). Note that the largest prime with distinct digits in Romanian alphabetical order (59847631: Cinci, Noua, Opt, Patru, Sapte, Sase, Trei, Unu) is merely the former prime with the digits in the first two prime positions reversed, and that the concatenation of these two primes in any order forms two other primes: 5894763159847631, 5984763158947631. [Beedassy]