12016861 has 2 divisors, whose sum is σ = 12016862. Its totient is φ = 12016860.

The previous prime is 12016859. The next prime is 12016877. The reversal of 12016861 is 16861021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11600836 + 416025 = 3406^2 + 645^2 .

It is an emirp because it is prime and its reverse (16861021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12016861 - 2¹ = 12016859 is a prime.

Together with 12016859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12016811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6008430 + 6008431.

It is an arithmetic number, because the mean of its divisors is an integer number (6008431).

Almost surely, 2^12016861 is an apocalyptic number.

It is an amenable number.

12016861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12016861 is an equidigital number, since it uses as much as digits as its factorization.

12016861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12016861 is about 3466.5344365807. The cubic root of 12016861 is about 229.0500262554.

Adding to 12016861 its reverse (16861021), we get a palindrome (28877882).

The spelling of 12016861 in words is "twelve million, sixteen thousand, eight hundred sixty-one".