174 = 2 x 3 x 29.
174 is a divisor of 592 - 1.
174 is the number of twin primes among the first thousand primes.
174 = 72 + 53.
174 is the smallest number that can be written as the sum of four positive distinct squares in six ways.
In 1978, Landon Noll and Laura Nickel used a CDC Cyber 174 to prove that the Mersenne number M21701 is a prime number.
Source: Prime Curios!