12716561 has 16 divisors (see below), whose sum is σ = 15821568. Its totient is φ = 10041600.

The previous prime is 12716537. The next prime is 12716569. The reversal of 12716561 is 16561721.

It is a cyclic number.

It is not a de Polignac number, because 12716561 - 2⁶ = 12716497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12716569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185 + ... + 5046.

It is an arithmetic number, because the mean of its divisors is an integer number (988848).

Almost surely, 2^12716561 is an apocalyptic number.

12716561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12716561 is a deficient number, since it is larger than the sum of its proper divisors (3105007).

12716561 is a wasteful number, since it uses less digits than its factorization.

12716561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272.

The product of its digits is 2520, while the sum is 29.

The square root of 12716561 is about 3566.0287435746. The cubic root of 12716561 is about 233.4120249322.

The spelling of 12716561 in words is "twelve million, seven hundred sixteen thousand, five hundred sixty-one".