12181795189 has 2 divisors, whose sum is σ = 12181795190. Its totient is φ = 12181795188.

The previous prime is 12181795183. The next prime is 12181795207. The reversal of 12181795189 is 98159718121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12178888164 + 2907025 = 110358^2 + 1705^2 .

It is an emirp because it is prime and its reverse (98159718121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12181795189 - 2¹³ = 12181786997 is a prime.

It is a super-2 number, since 2×12181795189² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181795183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090897594 + 6090897595.

It is an arithmetic number, because the mean of its divisors is an integer number (6090897595).

Almost surely, 2^12181795189 is an apocalyptic number.

It is an amenable number.

12181795189 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181795189 is an equidigital number, since it uses as much as digits as its factorization.

12181795189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 52.

The spelling of 12181795189 in words is "twelve billion, one hundred eighty-one million, seven hundred ninety-five thousand, one hundred eighty-nine".