181111945219 has 2 divisors, whose sum is σ = 181111945220. Its totient is φ = 181111945218.

The previous prime is 181111945213. The next prime is 181111945237. The reversal of 181111945219 is 912549111181.

It is a weak prime.

It is an emirp because it is prime and its reverse (912549111181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181111945219 - 2²¹ = 181109848067 is a prime.

It is a super-2 number, since 2×181111945219² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181111945213) 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, 90555972609 + 90555972610.

It is an arithmetic number, because the mean of its divisors is an integer number (90555972610).

Almost surely, 2^181111945219 is an apocalyptic number.

181111945219 is a deficient number, since it is larger than the sum of its proper divisors (1).

181111945219 is an equidigital number, since it uses as much as digits as its factorization.

181111945219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 43.

The spelling of 181111945219 in words is "one hundred eighty-one billion, one hundred eleven million, nine hundred forty-five thousand, two hundred nineteen".