12116861 has 2 divisors, whose sum is σ = 12116862. Its totient is φ = 12116860.

The previous prime is 12116843. The next prime is 12116873. The reversal of 12116861 is 16861121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9572836 + 2544025 = 3094^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 12116861 - 2¹⁴ = 12100477 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12116861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12116821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6058430 + 6058431.

It is an arithmetic number, because the mean of its divisors is an integer number (6058431).

Almost surely, 2^12116861 is an apocalyptic number.

It is an amenable number.

12116861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12116861 is an equidigital number, since it uses as much as digits as its factorization.

12116861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

The square root of 12116861 is about 3480.9281808161. The cubic root of 12116861 is about 229.6836292960.

Adding to 12116861 its reverse (16861121), we get a palindrome (28977982).

The spelling of 12116861 in words is "twelve million, one hundred sixteen thousand, eight hundred sixty-one".