12696991 has 2 divisors, whose sum is σ = 12696992. Its totient is φ = 12696990.

The previous prime is 12696973. The next prime is 12697021. The reversal of 12696991 is 19969621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12696991 - 2¹⁷ = 12565919 is a prime.

It is a super-2 number, since 2×12696991² = 322427160908162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12696191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6348495 + 6348496.

It is an arithmetic number, because the mean of its divisors is an integer number (6348496).

Almost surely, 2^12696991 is an apocalyptic number.

12696991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12696991 is an equidigital number, since it uses as much as digits as its factorization.

12696991 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12696991 is about 3563.2837383515. The cubic root of 12696991 is about 233.2922279064.

The spelling of 12696991 in words is "twelve million, six hundred ninety-six thousand, nine hundred ninety-one".