12811247 has 4 divisors (see below), whose sum is σ = 12831696. Its totient is φ = 12790800.

The previous prime is 12811241. The next prime is 12811259. The reversal of 12811247 is 74211821.

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 12811247 - 2⁴ = 12811231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9254 + ... + 10547.

It is an arithmetic number, because the mean of its divisors is an integer number (3207924).

Almost surely, 2^12811247 is an apocalyptic number.

12811247 is a deficient number, since it is larger than the sum of its proper divisors (20449).

12811247 is an equidigital number, since it uses as much as digits as its factorization.

12811247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20448.

The product of its digits is 896, while the sum is 26.

The square root of 12811247 is about 3579.2802349076. The cubic root of 12811247 is about 233.9899123905.

The spelling of 12811247 in words is "twelve million, eight hundred eleven thousand, two hundred forty-seven".