181081 has 2 divisors, whose sum is σ = 181082. Its totient is φ = 181080.

The previous prime is 181063. The next prime is 181087. The reversal of 181081 is 180181.

181081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99856 + 81225 = 316^2 + 285^2 .

It is an emirp because it is prime and its reverse (180181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181081 - 2⁹ = 180569 is a prime.

It is a super-2 number, since 2×181081² = 65580657122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90540 + 90541.

It is an arithmetic number, because the mean of its divisors is an integer number (90541).

2¹⁸¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

181081 is a deficient number, since it is larger than the sum of its proper divisors (1).

181081 is an equidigital number, since it uses as much as digits as its factorization.

181081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 181081 is about 425.5361324259. The cubic root of 181081 is about 56.5749651007.

Subtracting from 181081 its reverse (180181), we obtain a square (900 = 30²).

It can be divided in two parts, 1810 and 81, that added together give a triangular number (1891 = T₆₁).

The spelling of 181081 in words is "one hundred eighty-one thousand, eighty-one".