181681443 has 6 divisors (see below), whose sum is σ = 262428764. Its totient is φ = 121120956.

The previous prime is 181681441. The next prime is 181681447. The reversal of 181681443 is 344186181.

It is a happy number.

181681443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181681443 - 2¹ = 181681441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181681398 and 181681407.

It is not an unprimeable number, because it can be changed into a prime (181681441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10093405 + ... + 10093422.

Almost surely, 2^181681443 is an apocalyptic number.

181681443 is a deficient number, since it is larger than the sum of its proper divisors (80747321).

181681443 is a wasteful number, since it uses less digits than its factorization.

181681443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20186833 (or 20186830 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 181681443 is about 13478.9258845058. The cubic root of 181681443 is about 566.3742805729.

The spelling of 181681443 in words is "one hundred eighty-one million, six hundred eighty-one thousand, four hundred forty-three".