12813643 has 2 divisors, whose sum is σ = 12813644. Its totient is φ = 12813642.

The previous prime is 12813641. The next prime is 12813649. The reversal of 12813643 is 34631821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12813643 - 2¹ = 12813641 is a prime.

Together with 12813641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12813641) 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 as a sum of consecutive naturals, namely, 6406821 + 6406822.

It is an arithmetic number, because the mean of its divisors is an integer number (6406822).

Almost surely, 2^12813643 is an apocalyptic number.

12813643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12813643 is an equidigital number, since it uses as much as digits as its factorization.

12813643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 12813643 is about 3579.6149234240. The cubic root of 12813643 is about 234.0044986595.

It can be divided in two parts, 12813 and 643, that added together give a square (13456 = 116²).

The spelling of 12813643 in words is "twelve million, eight hundred thirteen thousand, six hundred forty-three".