181873 has 2 divisors, whose sum is σ = 181874. Its totient is φ = 181872.

The previous prime is 181871. The next prime is 181889. The reversal of 181873 is 378181.

It is a happy number.

181873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150544 + 31329 = 388^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 181873 - 2¹ = 181871 is a prime.

Together with 181871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (181871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90936 + 90937.

It is an arithmetic number, because the mean of its divisors is an integer number (90937).

2¹⁸¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

181873 is a deficient number, since it is larger than the sum of its proper divisors (1).

181873 is an equidigital number, since it uses as much as digits as its factorization.

181873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 181873 is about 426.4657078828. The cubic root of 181873 is about 56.6573264113.

It can be divided in two parts, 1818 and 73, that added together give a triangular number (1891 = T₆₁).

The spelling of 181873 in words is "one hundred eighty-one thousand, eight hundred seventy-three".