12243561 has 16 divisors (see below), whose sum is σ = 17867520. Its totient is φ = 7395920.

The previous prime is 12243557. The next prime is 12243563. The reversal of 12243561 is 16534221.

It is a cyclic number.

It is not a de Polignac number, because 12243561 - 2² = 12243557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12243563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18250 + ... + 18908.

It is an arithmetic number, because the mean of its divisors is an integer number (1116720).

Almost surely, 2^12243561 is an apocalyptic number.

12243561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12243561 is a deficient number, since it is larger than the sum of its proper divisors (5623959).

12243561 is a wasteful number, since it uses less digits than its factorization.

12243561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236.

The product of its digits is 1440, while the sum is 24.

The square root of 12243561 is about 3499.0800219486. The cubic root of 12243561 is about 230.4814175931.

Adding to 12243561 its reverse (16534221), we get a palindrome (28777782).

The spelling of 12243561 in words is "twelve million, two hundred forty-three thousand, five hundred sixty-one".