181 (number)

181 is a number. It comes after 180 and before 182.

 In mathematics 

 181 is an odd number.
 It is a prime number, which means it can only be divided evenly by 1 and itself.
 181 is a palindromic number, because it reads the same forward and backward.
 It is also a twin prime with 179 (two prime numbers that differ by 2).
 181 is a centered square number.

 In science 

 181 is the atomic mass of the most common isotope of tantalum (Ta).

 Fun fact 

 181 is a prime number that is also palindromic. This makes it part of a special group of numbers known as palindromic primes.

Category:Integers