12217949 has 2 divisors, whose sum is σ = 12217950. Its totient is φ = 12217948.

The previous prime is 12217943. The next prime is 12217957. The reversal of 12217949 is 94971221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12201049 + 16900 = 3493^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 12217949 - 2⁸ = 12217693 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12217943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108974 + 6108975.

It is an arithmetic number, because the mean of its divisors is an integer number (6108975).

Almost surely, 2^12217949 is an apocalyptic number.

It is an amenable number.

12217949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217949 is an equidigital number, since it uses as much as digits as its factorization.

12217949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 12217949 is about 3495.4182868435. The cubic root of 12217949 is about 230.3205926220.

The spelling of 12217949 in words is "twelve million, two hundred seventeen thousand, nine hundred forty-nine".