12891313 has 4 divisors (see below), whose sum is σ = 13102708. Its totient is φ = 12679920.

The previous prime is 12891259. The next prime is 12891353. The reversal of 12891313 is 31319821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31319821 = 13 ⋅2409217.

It can be written as a sum of positive squares in 2 ways, for example, as 1682209 + 11209104 = 1297^2 + 3348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12891313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891353) 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, 105606 + ... + 105727.

It is an arithmetic number, because the mean of its divisors is an integer number (3275677).

Almost surely, 2^12891313 is an apocalyptic number.

It is an amenable number.

12891313 is a deficient number, since it is larger than the sum of its proper divisors (211395).

12891313 is an equidigital number, since it uses as much as digits as its factorization.

12891313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211394.

The product of its digits is 1296, while the sum is 28.

The square root of 12891313 is about 3590.4474651497. The cubic root of 12891313 is about 234.4763532726.

The spelling of 12891313 in words is "twelve million, eight hundred ninety-one thousand, three hundred thirteen".