12661143 has 16 divisors (see below), whose sum is σ = 18475776. Its totient is φ = 7648640.

The previous prime is 12661123. The next prime is 12661147. The reversal of 12661143 is 34116621.

It is a cyclic number.

It is not a de Polignac number, because 12661143 - 2¹⁴ = 12644759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661147) 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, 19246 + ... + 19892.

It is an arithmetic number, because the mean of its divisors is an integer number (1154736).

Almost surely, 2^12661143 is an apocalyptic number.

12661143 is a deficient number, since it is larger than the sum of its proper divisors (5814633).

12661143 is a wasteful number, since it uses less digits than its factorization.

12661143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its digits is 864, while the sum is 24.

The square root of 12661143 is about 3558.2499912176. The cubic root of 12661143 is about 233.0724660548.

Adding to 12661143 its reverse (34116621), we get a palindrome (46777764).

The spelling of 12661143 in words is "twelve million, six hundred sixty-one thousand, one hundred forty-three".