12219709 has 2 divisors, whose sum is σ = 12219710. Its totient is φ = 12219708.

The previous prime is 12219677. The next prime is 12219737. The reversal of 12219709 is 90791221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 727609 = 3390^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 12219709 - 2⁵ = 12219677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109854 + 6109855.

It is an arithmetic number, because the mean of its divisors is an integer number (6109855).

Almost surely, 2^12219709 is an apocalyptic number.

It is an amenable number.

12219709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219709 is an equidigital number, since it uses as much as digits as its factorization.

12219709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 12219709 is about 3495.6700359159. The cubic root of 12219709 is about 230.3316513460.

The spelling of 12219709 in words is "twelve million, two hundred nineteen thousand, seven hundred nine".