181 (number)
181 is a number. It comes after 180 and before 182.
| ||||
|---|---|---|---|---|
| Cardinal | one hundred and eighty-one | |||
| Ordinal | 181st (one hundred and eighty-first) | |||
| Factorization | 181 | |||
| Divisors | 1, 181 | |||
| Roman numeral | CLXXXI | |||
| Binary | 101101012 | |||
| Ternary | 202013 | |||
| Quaternary | 23114 | |||
| Quinary | 12115 | |||
| Senary | 5016 | |||
| Octal | 2658 | |||
| Duodecimal | 13112 | |||
| Hexadecimal | B516 | |||
| Vigesimal | 9120 | |||
| Base 36 | 5136 | |||
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.
