12166813 has 2 divisors, whose sum is σ = 12166814. Its totient is φ = 12166812.

The previous prime is 12166811. The next prime is 12166841. The reversal of 12166813 is 31866121.

12166813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (12166841) can be obtained adding 12166813 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12089529 + 77284 = 3477^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 12166813 - 2¹ = 12166811 is a prime.

Together with 12166811, 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 (12166811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6083406 + 6083407.

It is an arithmetic number, because the mean of its divisors is an integer number (6083407).

Almost surely, 2^12166813 is an apocalyptic number.

It is an amenable number.

12166813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12166813 is an equidigital number, since it uses as much as digits as its factorization.

12166813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 12166813 is about 3488.0958989110. The cubic root of 12166813 is about 229.9988216701.

The spelling of 12166813 in words is "twelve million, one hundred sixty-six thousand, eight hundred thirteen".