12172322209 has 2 divisors, whose sum is σ = 12172322210. Its totient is φ = 12172322208.

The previous prime is 12172322191. The next prime is 12172322237. The reversal of 12172322209 is 90222327121.

12172322209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6436531984 + 5735790225 = 80228^2 + 75735^2 .

It is a cyclic number.

It is not a de Polignac number, because 12172322209 - 2⁹ = 12172321697 is a prime.

It is not a weakly prime, because it can be changed into another prime (12172322909) 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, 6086161104 + 6086161105.

It is an arithmetic number, because the mean of its divisors is an integer number (6086161105).

Almost surely, 2^12172322209 is an apocalyptic number.

It is an amenable number.

12172322209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172322209 is an equidigital number, since it uses as much as digits as its factorization.

12172322209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 12172322209 in words is "twelve billion, one hundred seventy-two million, three hundred twenty-two thousand, two hundred nine".