12042561 has 16 divisors (see below), whose sum is σ = 17317440. Its totient is φ = 7418880.

The previous prime is 12042557. The next prime is 12042581. The reversal of 12042561 is 16524021.

It is not a de Polignac number, because 12042561 - 2² = 12042557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12042551) 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 15 ways as a sum of consecutive naturals, for example, 240 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (1082340).

Almost surely, 2^12042561 is an apocalyptic number.

It is an amenable number.

12042561 is a deficient number, since it is larger than the sum of its proper divisors (5274879).

12042561 is a wasteful number, since it uses less digits than its factorization.

12042561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 12042561 is about 3470.2393289224. The cubic root of 12042561 is about 229.2131968255.

Adding to 12042561 its reverse (16524021), we get a palindrome (28566582).

The spelling of 12042561 in words is "twelve million, forty-two thousand, five hundred sixty-one".