181120189 has 2 divisors, whose sum is σ = 181120190. Its totient is φ = 181120188.

The previous prime is 181120153. The next prime is 181120211. The reversal of 181120189 is 981021181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167184900 + 13935289 = 12930^2 + 3733^2 .

It is a cyclic number.

It is not a de Polignac number, because 181120189 - 2¹⁵ = 181087421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181120189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181120889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90560094 + 90560095.

It is an arithmetic number, because the mean of its divisors is an integer number (90560095).

Almost surely, 2^181120189 is an apocalyptic number.

It is an amenable number.

181120189 is a deficient number, since it is larger than the sum of its proper divisors (1).

181120189 is an equidigital number, since it uses as much as digits as its factorization.

181120189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 181120189 is about 13458.0900948091. The cubic root of 181120189 is about 565.7904606704.

The spelling of 181120189 in words is "one hundred eighty-one million, one hundred twenty thousand, one hundred eighty-nine".