12211709 has 2 divisors, whose sum is σ = 12211710. Its totient is φ = 12211708.

The previous prime is 12211687. The next prime is 12211721. The reversal of 12211709 is 90711221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7171684 + 5040025 = 2678^2 + 2245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211709 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 (12211789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105854 + 6105855.

It is an arithmetic number, because the mean of its divisors is an integer number (6105855).

Almost surely, 2^12211709 is an apocalyptic number.

It is an amenable number.

12211709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211709 is an equidigital number, since it uses as much as digits as its factorization.

12211709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12211709 is about 3494.5255758114. The cubic root of 12211709 is about 230.2813758588.

The spelling of 12211709 in words is "twelve million, two hundred eleven thousand, seven hundred nine".