12206638949 has 2 divisors, whose sum is σ = 12206638950. Its totient is φ = 12206638948.

The previous prime is 12206638933. The next prime is 12206638993. The reversal of 12206638949 is 94983660221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891297025 + 2315341924 = 99455^2 + 48118^2 .

It is an emirp because it is prime and its reverse (94983660221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12206638949 - 2⁴ = 12206638933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12206638897 and 12206638906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12206638049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6103319474 + 6103319475.

It is an arithmetic number, because the mean of its divisors is an integer number (6103319475).

Almost surely, 2^12206638949 is an apocalyptic number.

It is an amenable number.

12206638949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12206638949 is an equidigital number, since it uses as much as digits as its factorization.

12206638949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 12206638949 in words is "twelve billion, two hundred six million, six hundred thirty-eight thousand, nine hundred forty-nine".