12688091 has 8 divisors (see below), whose sum is σ = 13693680. Its totient is φ = 11686752.

The previous prime is 12688087. The next prime is 12688097. The reversal of 12688091 is 19088621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12688091 - 2² = 12688087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12688097) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8165 + ... + 9593.

It is an arithmetic number, because the mean of its divisors is an integer number (1711710).

Almost surely, 2^12688091 is an apocalyptic number.

12688091 is a deficient number, since it is larger than the sum of its proper divisors (1005589).

12688091 is a wasteful number, since it uses less digits than its factorization.

12688091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 12688091 is about 3562.0346713641. The cubic root of 12688091 is about 233.2377061659.

The spelling of 12688091 in words is "twelve million, six hundred eighty-eight thousand, ninety-one".