12561276 has 48 divisors (see below), whose sum is σ = 36076544. Its totient is φ = 3312576.

The previous prime is 12561257. The next prime is 12561287. The reversal of 12561276 is 67216521.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4660 + ... + 6843.

Almost surely, 2^12561276 is an apocalyptic number.

It is an amenable number.

12561276 is an abundant number, since it is smaller than the sum of its proper divisors (23515268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561276 is a wasteful number, since it uses less digits than its factorization.

12561276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11530 (or 11528 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 12561276 is about 3544.1890468766. The cubic root of 12561276 is about 232.4580476971.

Adding to 12561276 its reverse (67216521), we get a palindrome (79777797).

The spelling of 12561276 in words is "twelve million, five hundred sixty-one thousand, two hundred seventy-six".