12681091 has 4 divisors (see below), whose sum is σ = 13118400. Its totient is φ = 12243784.

The previous prime is 12681089. The next prime is 12681103. The reversal of 12681091 is 19018621.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12681091 - 2¹ = 12681089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12681391) 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 3 ways as a sum of consecutive naturals, for example, 218611 + ... + 218668.

It is an arithmetic number, because the mean of its divisors is an integer number (3279600).

Almost surely, 2^12681091 is an apocalyptic number.

12681091 is a deficient number, since it is larger than the sum of its proper divisors (437309).

12681091 is an equidigital number, since it uses as much as digits as its factorization.

12681091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437308.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12681091 is about 3561.0519513200. The cubic root of 12681091 is about 233.1948059828.

The spelling of 12681091 in words is "twelve million, six hundred eighty-one thousand, ninety-one".