6061

This number is a composite.

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The only 2-sphenic number concatenated from two successive double-digit numbers, i.e., 11*19*29. [Loungrides]

The only invertible 2-sphenic number (1909 = 23 x 83) is a brilliant number with the concatenation in the order of its prime factors, i.e. 2383, being a prime. [Loungrides]