12891667 has 4 divisors (see below), whose sum is σ = 13134960. Its totient is φ = 12648376.

The previous prime is 12891653. The next prime is 12891713. The reversal of 12891667 is 76619821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76619821 = 53 ⋅1445657.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12891667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891607) 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, 121567 + ... + 121672.

It is an arithmetic number, because the mean of its divisors is an integer number (3283740).

Almost surely, 2^12891667 is an apocalyptic number.

12891667 is a deficient number, since it is larger than the sum of its proper divisors (243293).

12891667 is an equidigital number, since it uses as much as digits as its factorization.

12891667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243292.

The product of its digits is 36288, while the sum is 40.

The square root of 12891667 is about 3590.4967622879. The cubic root of 12891667 is about 234.4784995207.

The spelling of 12891667 in words is "twelve million, eight hundred ninety-one thousand, six hundred sixty-seven".