12643105 has 4 divisors (see below), whose sum is σ = 15171732. Its totient is φ = 10114480.

The previous prime is 12643049. The next prime is 12643109. The reversal of 12643105 is 50134621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50134621 = 1597 ⋅31393.

It can be written as a sum of positive squares in 2 ways, for example, as 9345249 + 3297856 = 3057^2 + 1816^2 .

It is not a de Polignac number, because 12643105 - 2⁹ = 12642593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643109) 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, 1264306 + ... + 1264315.

It is an arithmetic number, because the mean of its divisors is an integer number (3792933).

Almost surely, 2^12643105 is an apocalyptic number.

It is an amenable number.

12643105 is a deficient number, since it is larger than the sum of its proper divisors (2528627).

12643105 is an equidigital number, since it uses as much as digits as its factorization.

12643105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528626.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12643105 is about 3555.7144148539. The cubic root of 12643105 is about 232.9617293637.

Adding to 12643105 its reverse (50134621), we get a palindrome (62777726).

The spelling of 12643105 in words is "twelve million, six hundred forty-three thousand, one hundred five".