12172117 has 2 divisors, whose sum is σ = 12172118. Its totient is φ = 12172116.

The previous prime is 12172087. The next prime is 12172133. The reversal of 12172117 is 71127121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 54756 = 3481^2 + 234^2 .

It is a cyclic number.

It is not a de Polignac number, because 12172117 - 2¹⁵ = 12139349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12172157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6086058 + 6086059.

It is an arithmetic number, because the mean of its divisors is an integer number (6086059).

Almost surely, 2^12172117 is an apocalyptic number.

It is an amenable number.

12172117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12172117 is an equidigital number, since it uses as much as digits as its factorization.

12172117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196, while the sum is 22.

The square root of 12172117 is about 3488.8561162650. The cubic root of 12172117 is about 230.0322387072.

Adding to 12172117 its reverse (71127121), we get a palindrome (83299238).

The spelling of 12172117 in words is "twelve million, one hundred seventy-two thousand, one hundred seventeen".