12606991 has 2 divisors, whose sum is σ = 12606992. Its totient is φ = 12606990.

The previous prime is 12606989. The next prime is 12607009. The reversal of 12606991 is 19960621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12606991 - 2¹ = 12606989 is a prime.

Together with 12606989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12606901) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6303495 + 6303496.

It is an arithmetic number, because the mean of its divisors is an integer number (6303496).

Almost surely, 2^12606991 is an apocalyptic number.

12606991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12606991 is an equidigital number, since it uses as much as digits as its factorization.

12606991 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 34.

The square root of 12606991 is about 3550.6324788691. The cubic root of 12606991 is about 232.7397057613.

The spelling of 12606991 in words is "twelve million, six hundred six thousand, nine hundred ninety-one".