181181 has 16 divisors (see below), whose sum is σ = 244608. Its totient is φ = 129600.

The previous prime is 181157. The next prime is 181183.

181181 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181181 is a prime.

It is a super-2 number, since 2×181181² = 65653109522, which contains 22 as substring.

181181 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181181.

It is not an unprimeable number, because it can be changed into a prime (181183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911 + ... + 1091.

It is an arithmetic number, because the mean of its divisors is an integer number (15288).

2¹⁸¹¹⁸¹ is an apocalyptic number.

181181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

181181 is a deficient number, since it is larger than the sum of its proper divisors (63427).

181181 is a wasteful number, since it uses less digits than its factorization.

181181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its digits is 64, while the sum is 20.

The square root of 181181 is about 425.6536150440. The cubic root of 181181 is about 56.5853774860.

The spelling of 181181 in words is "one hundred eighty-one thousand, one hundred eighty-one".