12643091 has 4 divisors (see below), whose sum is σ = 12670632. Its totient is φ = 12615552.

The previous prime is 12643049. The next prime is 12643109. The reversal of 12643091 is 19034621.

12643091 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12643091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12643091.

It is not an unprimeable number, because it can be changed into a prime (12643021) 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 in 3 ways as a sum of consecutive naturals, for example, 13070 + ... + 14003.

It is an arithmetic number, because the mean of its divisors is an integer number (3167658).

Almost surely, 2^12643091 is an apocalyptic number.

12643091 is a deficient number, since it is larger than the sum of its proper divisors (27541).

12643091 is an equidigital number, since it uses as much as digits as its factorization.

12643091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27540.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 12643091 is about 3555.7124461913. The cubic root of 12643091 is about 232.9616433757.

The spelling of 12643091 in words is "twelve million, six hundred forty-three thousand, ninety-one".