12876561 has 6 divisors (see below), whose sum is σ = 18599490. Its totient is φ = 8584368.

The previous prime is 12876559. The next prime is 12876569. The reversal of 12876561 is 16567821.

12876561 is a `hidden beast` number, since 1 + 28 + 76 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 24336 = 3585^2 + 156^2 .

It is not a de Polignac number, because 12876561 - 2¹ = 12876559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12876569) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 715356 + ... + 715373.

It is an arithmetic number, because the mean of its divisors is an integer number (3099915).

Almost surely, 2^12876561 is an apocalyptic number.

It is an amenable number.

12876561 is a deficient number, since it is larger than the sum of its proper divisors (5722929).

12876561 is a wasteful number, since it uses less digits than its factorization.

12876561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430735 (or 1430732 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12876561 is about 3588.3925370561. The cubic root of 12876561 is about 234.3868791846.

The spelling of 12876561 in words is "twelve million, eight hundred seventy-six thousand, five hundred sixty-one".