181983 has 4 divisors (see below), whose sum is σ = 242648. Its totient is φ = 121320.

The previous prime is 181981. The next prime is 181997. The reversal of 181983 is 389181.

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

It is not a de Polignac number, because 181983 - 2¹ = 181981 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 181983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30328 + ... + 30333.

It is an arithmetic number, because the mean of its divisors is an integer number (60662).

2¹⁸¹⁹⁸³ is an apocalyptic number.

181983 is a deficient number, since it is larger than the sum of its proper divisors (60665).

181983 is an equidigital number, since it uses as much as digits as its factorization.

181983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60664.

The product of its digits is 1728, while the sum is 30.

The square root of 181983 is about 426.5946553814. The cubic root of 181983 is about 56.6687465596.

The spelling of 181983 in words is "one hundred eighty-one thousand, nine hundred eighty-three".