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# What unusual mathematical property does 1701 have?

Question #97428. Asked by tragic_flawed. (Jul 11 08 1:57 AM)

gentlegiant17

1701 is an odd number and a Stirling number of the second kind.

The number 1701 also has unusual properties as it:

belongs to a set of numbers such that n2 contains exactly seven different digits

is a decagonal and a 13-gonal number

is divisible by the square of the sum of its digits

belongs to a set of numbers with only palindromic prime factors whose sum is palindromic

is a First Beale cipher

belongs to a set of numbers whose digits of prime factors of are either 3 or 7

and its palindrome are divisible by 7

http://en.wikipedia.org/wiki/1701_%28number%29

 Jul 11 08, 2:30 AM

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