171 = 32 x 19.
171 is a Harshad number, divisible by the sum of its digits (1 + 7 + 1 = 9).
171 is the 18th triangular number, the sum of the integers from 1 to 18.
If you write n consecutive digits starting with 1 and following 9 by 0, the smallest n that will give you a prime number is 171.
171 is a Harshad number, divisible by the sum of its digits (1 + 7 + 1 = 9).
171 is the 18th triangular number, the sum of the integers from 1 to 18.
If you write n consecutive digits starting with 1 and following 9 by 0, the smallest n that will give you a prime number is 171.
Source: Number Gossip
