12681563 has 4 divisors (see below), whose sum is σ = 12759528. Its totient is φ = 12603600.

The previous prime is 12681527. The next prime is 12681577. The reversal of 12681563 is 36518621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36518621 = 647 ⋅56443.

It is a cyclic number.

It is not a de Polignac number, because 12681563 - 2⁶ = 12681499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12681503) 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, 38738 + ... + 39063.

It is an arithmetic number, because the mean of its divisors is an integer number (3189882).

Almost surely, 2^12681563 is an apocalyptic number.

12681563 is a deficient number, since it is larger than the sum of its proper divisors (77965).

12681563 is an equidigital number, since it uses as much as digits as its factorization.

12681563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77964.

The product of its digits is 8640, while the sum is 32.

The square root of 12681563 is about 3561.1182232552. The cubic root of 12681563 is about 233.1976991771.

The spelling of 12681563 in words is "twelve million, six hundred eighty-one thousand, five hundred sixty-three".