173 (one hundred [and] seventy-three) is the natural number following 172 and preceding 174.

In mathematics

173 is:

  • an odd number.
  • a deficient number.
  • an odious number.
  • a balanced prime.
  • an Eisenstein prime with no imaginary part.
  • a Sophie Germain prime.
  • a Pythagorean prime.
  • a Higgs prime.
  • an isolated prime.
  • a regular prime.
  • a sexy prime.
  • a twice sexy prime (167, 173; 173, 179).
  • a truncatable prime.
  • an inconsummate number.
  • the sum of 2 squares: 2<sup>2</sup> + 13<sup>2</sup>.
  • the sum of three consecutive prime numbers: 53 + 59 + 61.
  • Palindromic number in bases 3 (20102<sub>3</sub>) and 9 (212<sub>9</sub>).
  • the 40th prime number following 167 and preceding 179.

References

  • Number Facts and Trivia: 173
  • Prime curiosities: 173
  • Number Gossip: 173