12635543 has 4 divisors (see below), whose sum is σ = 12656640. Its totient is φ = 12614448.

The previous prime is 12635531. The next prime is 12635563. The reversal of 12635543 is 34553621.

12635543 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: 34553621 = 337 ⋅102533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12635543 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 (12635563) 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, 9623 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (3164160).

Almost surely, 2^12635543 is an apocalyptic number.

12635543 is a deficient number, since it is larger than the sum of its proper divisors (21097).

12635543 is an equidigital number, since it uses as much as digits as its factorization.

12635543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21096.

The product of its digits is 10800, while the sum is 29.

The square root of 12635543 is about 3554.6508970643. The cubic root of 12635543 is about 232.9152743212.

The spelling of 12635543 in words is "twelve million, six hundred thirty-five thousand, five hundred forty-three".