12991049 has 2 divisors, whose sum is σ = 12991050. Its totient is φ = 12991048.

The previous prime is 12991037. The next prime is 12991051. The reversal of 12991049 is 94019921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8809024 + 4182025 = 2968^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 12991049 - 2⁸ = 12990793 is a prime.

Together with 12991051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12991249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495524 + 6495525.

It is an arithmetic number, because the mean of its divisors is an integer number (6495525).

Almost surely, 2^12991049 is an apocalyptic number.

It is an amenable number.

12991049 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991049 is an equidigital number, since it uses as much as digits as its factorization.

12991049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 12991049 is about 3604.3097813590. The cubic root of 12991049 is about 235.0794902358.

The spelling of 12991049 in words is "twelve million, nine hundred ninety-one thousand, forty-nine".