12643501 has 4 divisors (see below), whose sum is σ = 13616092. Its totient is φ = 11670912.

The previous prime is 12643489. The next prime is 12643511. The reversal of 12643501 is 10534621.

12643501 is digitally balanced in base 2, 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: 10534621 = 23 ⋅458027.

It can be written as a sum of positive squares in 2 ways, for example, as 1687401 + 10956100 = 1299^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 12643501 - 2⁵ = 12643469 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 (12643511) 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, 486276 + ... + 486301.

It is an arithmetic number, because the mean of its divisors is an integer number (3404023).

Almost surely, 2^12643501 is an apocalyptic number.

It is an amenable number.

12643501 is a deficient number, since it is larger than the sum of its proper divisors (972591).

12643501 is an equidigital number, since it uses as much as digits as its factorization.

12643501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972590.

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

The square root of 12643501 is about 3555.7700994299. The cubic root of 12643501 is about 232.9641615690.

The spelling of 12643501 in words is "twelve million, six hundred forty-three thousand, five hundred one".