181255 has 4 divisors (see below), whose sum is σ = 217512. Its totient is φ = 145000.

The previous prime is 181253. The next prime is 181273. The reversal of 181255 is 552181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 181255 - 2¹ = 181253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

181255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18121 + ... + 18130.

It is an arithmetic number, because the mean of its divisors is an integer number (54378).

2¹⁸¹²⁵⁵ is an apocalyptic number.

181255 is a deficient number, since it is larger than the sum of its proper divisors (36257).

181255 is an equidigital number, since it uses as much as digits as its factorization.

181255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36256.

The product of its digits is 400, while the sum is 22.

The square root of 181255 is about 425.7405313099. The cubic root of 181255 is about 56.5930801847.

The spelling of 181255 in words is "one hundred eighty-one thousand, two hundred fifty-five".