This number is a prime.
The smallest prime number which is a sum of distinct multidigit primes beginning and ending with the digit seven: 2281 = 727 + 757 + 797. [Capelle]
Index p of the largest known perfect number 2p -
1(2p - 1) having both a prime subscript
(17) and a prime number of digits (1373). [Beedassy]
The only known Mersenne prime exponent whose product of digits is a power of two (2*2*8*1 = 2^5). [Arf]
(There are 2 curios for this number that have not yet been approved by an editor.)
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