12966991 has 2 divisors, whose sum is σ = 12966992. Its totient is φ = 12966990.

The previous prime is 12966977. The next prime is 12966997. The reversal of 12966991 is 19966921.

12966991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12966991 - 2¹⁷ = 12835919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12966997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6483495 + 6483496.

It is an arithmetic number, because the mean of its divisors is an integer number (6483496).

Almost surely, 2^12966991 is an apocalyptic number.

12966991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12966991 is an equidigital number, since it uses as much as digits as its factorization.

12966991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 12966991 is about 3600.9708413149. The cubic root of 12966991 is about 234.9342867417.

The spelling of 12966991 in words is "twelve million, nine hundred sixty-six thousand, nine hundred ninety-one".