12643311 has 4 divisors (see below), whose sum is σ = 16857752. Its totient is φ = 8428872.

The previous prime is 12643283. The next prime is 12643313. The reversal of 12643311 is 11334621.

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

It is not a de Polignac number, because 12643311 - 2¹¹ = 12641263 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 (12643313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2107216 + ... + 2107221.

It is an arithmetic number, because the mean of its divisors is an integer number (4214438).

Almost surely, 2^12643311 is an apocalyptic number.

12643311 is a deficient number, since it is larger than the sum of its proper divisors (4214441).

12643311 is an equidigital number, since it uses as much as digits as its factorization.

12643311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214440.

The product of its digits is 432, while the sum is 21.

The square root of 12643311 is about 3555.7433821917. The cubic root of 12643311 is about 232.9629946081.

Adding to 12643311 its reverse (11334621), we get a palindrome (23977932).

The spelling of 12643311 in words is "twelve million, six hundred forty-three thousand, three hundred eleven".