12201917309 has 2 divisors, whose sum is σ = 12201917310. Its totient is φ = 12201917308.

The previous prime is 12201917293. The next prime is 12201917327. The reversal of 12201917309 is 90371910221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7067764900 + 5134152409 = 84070^2 + 71653^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201917309 - 2⁴ = 12201917293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12201917339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100958654 + 6100958655.

It is an arithmetic number, because the mean of its divisors is an integer number (6100958655).

Almost surely, 2^12201917309 is an apocalyptic number.

It is an amenable number.

12201917309 is a deficient number, since it is larger than the sum of its proper divisors (1).

12201917309 is an equidigital number, since it uses as much as digits as its factorization.

12201917309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 12201917309 in words is "twelve billion, two hundred one million, nine hundred seventeen thousand, three hundred nine".