109

109 comes after 108 and before 110. 109 is the 29th prime number, so it is a prime with a prime subscript. The previous prime is 107, making them both twin primes. 109 is a centered triangular number. There are exactly 109 different families of subsets of a three-element set whose union includes all three elements, 109 different loops (invertible but not necessarily associative binary operations with an identity) on six elements, and 109 squares on an infinite chessboard that can be reached by a knight within three moves. 109 is also the atomic number of meitnerium. The diameter of the sun is about 109.1 to 109.5 the diameter of the earth.

Year 109: Year 109 (CIX) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Palma and Tullus (or, less frequently, year 862 Ab urbe condita). The denomination 109 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Angel Number 109: We count our body parts so as to know what is normal and what is not normal. Five fingers on each hand are normal, when they are more than that or less then that may be considered to be abnormal. Two eyes, two legs, one mouth, and other function parts in the body. So far no other way has been invented on how to know the number of body parts that we have. You might worry about the constant appearance of number 109. Yet it has a message for you from your birth angels.