12320032181 has 2 divisors, whose sum is σ = 12320032182. Its totient is φ = 12320032180.

The previous prime is 12320032139. The next prime is 12320032229. The reversal of 12320032181 is 18123002321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11417991025 + 902041156 = 106855^2 + 30034^2 .

It is an emirp because it is prime and its reverse (18123002321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12320032181 - 2¹⁸ = 12319770037 is a prime.

It is a super-2 number, since 2×12320032181² (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 (12320032111) 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, 6160016090 + 6160016091.

It is an arithmetic number, because the mean of its divisors is an integer number (6160016091).

Almost surely, 2^12320032181 is an apocalyptic number.

It is an amenable number.

12320032181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320032181 is an equidigital number, since it uses as much as digits as its factorization.

12320032181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 12320032181 in words is "twelve billion, three hundred twenty million, thirty-two thousand, one hundred eighty-one".