12197917 has 2 divisors, whose sum is σ = 12197918. Its totient is φ = 12197916.

The previous prime is 12197909. The next prime is 12197921. The reversal of 12197917 is 71979121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8173881 + 4024036 = 2859^2 + 2006^2 .

It is a cyclic number.

It is not a de Polignac number, because 12197917 - 2³ = 12197909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12197947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6098958 + 6098959.

It is an arithmetic number, because the mean of its divisors is an integer number (6098959).

Almost surely, 2^12197917 is an apocalyptic number.

It is an amenable number.

12197917 is a deficient number, since it is larger than the sum of its proper divisors (1).

12197917 is an equidigital number, since it uses as much as digits as its factorization.

12197917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 37.

The square root of 12197917 is about 3492.5516460032. The cubic root of 12197917 is about 230.1946493362.

The spelling of 12197917 in words is "twelve million, one hundred ninety-seven thousand, nine hundred seventeen".