12172322191 has 2 divisors, whose sum is σ = 12172322192. Its totient is φ = 12172322190.

The previous prime is 12172322161. The next prime is 12172322209. The reversal of 12172322191 is 19122327121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12172322191 - 2⁵ = 12172322159 is a prime.

It is a super-2 number, since 2×12172322191² (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 (12172322111) 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, 6086161095 + 6086161096.

It is an arithmetic number, because the mean of its divisors is an integer number (6086161096).

Almost surely, 2^12172322191 is an apocalyptic number.

12172322191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172322191 is an equidigital number, since it uses as much as digits as its factorization.

12172322191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The spelling of 12172322191 in words is "twelve billion, one hundred seventy-two million, three hundred twenty-two thousand, one hundred ninety-one".