12561443 has 4 divisors (see below), whose sum is σ = 12660480. Its totient is φ = 12462408.

The previous prime is 12561431. The next prime is 12561481. The reversal of 12561443 is 34416521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12561443 - 2⁸ = 12561187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12563443) 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, 49328 + ... + 49581.

It is an arithmetic number, because the mean of its divisors is an integer number (3165120).

Almost surely, 2^12561443 is an apocalyptic number.

12561443 is a deficient number, since it is larger than the sum of its proper divisors (99037).

12561443 is an equidigital number, since it uses as much as digits as its factorization.

12561443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99036.

The product of its digits is 2880, while the sum is 26.

The square root of 12561443 is about 3544.2126064896. The cubic root of 12561443 is about 232.4590778558.

Adding to 12561443 its reverse (34416521), we get a palindrome (46977964).

The spelling of 12561443 in words is "twelve million, five hundred sixty-one thousand, four hundred forty-three".