12643145 has 4 divisors (see below), whose sum is σ = 15171780. Its totient is φ = 10114512.

The previous prime is 12643117. The next prime is 12643177. The reversal of 12643145 is 54134621.

12643145 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54134621 = 6427 ⋅8423.

It can be written as a sum of positive squares in 2 ways, for example, as 9966649 + 2676496 = 3157^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643145 - 2¹⁰ = 12642121 is a prime.

It is an unprimeable number.

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, 1264310 + ... + 1264319.

It is an arithmetic number, because the mean of its divisors is an integer number (3792945).

Almost surely, 2^12643145 is an apocalyptic number.

It is an amenable number.

12643145 is a deficient number, since it is larger than the sum of its proper divisors (2528635).

12643145 is an equidigital number, since it uses as much as digits as its factorization.

12643145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528634.

The product of its digits is 2880, while the sum is 26.

The square root of 12643145 is about 3555.7200395982. The cubic root of 12643145 is about 232.9619750433.

Adding to 12643145 its reverse (54134621), we get a palindrome (66777766).

The spelling of 12643145 in words is "twelve million, six hundred forty-three thousand, one hundred forty-five".