181 (number)

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

• 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.

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

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