12991037 has 2 divisors, whose sum is σ = 12991038. Its totient is φ = 12991036.

The previous prime is 12990979. The next prime is 12991049. The reversal of 12991037 is 73019921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8886361 + 4104676 = 2981^2 + 2026^2 .

It is a cyclic number.

It is not a de Polignac number, because 12991037 - 2¹⁰ = 12990013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12990994 and 12991012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12991057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495518 + 6495519.

It is an arithmetic number, because the mean of its divisors is an integer number (6495519).

Almost surely, 2^12991037 is an apocalyptic number.

It is an amenable number.

12991037 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991037 is an equidigital number, since it uses as much as digits as its factorization.

12991037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 12991037 is about 3604.3081166848. The cubic root of 12991037 is about 235.0794178538.

The spelling of 12991037 in words is "twelve million, nine hundred ninety-one thousand, thirty-seven".