181681441 has 2 divisors, whose sum is σ = 181681442. Its totient is φ = 181681440.

The previous prime is 181681417. The next prime is 181681447. The reversal of 181681441 is 144186181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174900625 + 6780816 = 13225^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 181681441 - 2¹⁵ = 181648673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181681397 and 181681406.

It is not a weakly prime, because it can be changed into another prime (181681447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90840720 + 90840721.

It is an arithmetic number, because the mean of its divisors is an integer number (90840721).

Almost surely, 2^181681441 is an apocalyptic number.

It is an amenable number.

181681441 is a deficient number, since it is larger than the sum of its proper divisors (1).

181681441 is an equidigital number, since it uses as much as digits as its factorization.

181681441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 34.

The square root of 181681441 is about 13478.9258103159. The cubic root of 181681441 is about 566.3742784946.

The spelling of 181681441 in words is "one hundred eighty-one million, six hundred eighty-one thousand, four hundred forty-one".