Number Gossip

(Enter a number and I'll tell you everything you wanted to know about it but were afraid to ask.)

Unique Properties of 161

  • 161 is the smallest composite number n whose Euler totient divides the sum of the Euler totients of the numbers less than or equal to n and not relatively prime to n
  • 161 is the number of intersections of diagonals inside a regular decagon
  • digits in Morse code can be represented in base 3 with 1 for a dot and and 2 for a dash, coded one in base 3 is evaluated to 161

Common Properties of 161

Composite
Deficient
Odd
Odious
Palindrome
Square-free
Undulating