12818161 has 2 divisors, whose sum is σ = 12818162. Its totient is φ = 12818160.

The previous prime is 12818123. The next prime is 12818173. The reversal of 12818161 is 16181821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 874225 = 3456^2 + 935^2 .

It is an emirp because it is prime and its reverse (16181821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12818161 - 2¹³ = 12809969 is a prime.

It is not a weakly prime, because it can be changed into another prime (12818101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6409080 + 6409081.

It is an arithmetic number, because the mean of its divisors is an integer number (6409081).

Almost surely, 2^12818161 is an apocalyptic number.

It is an amenable number.

12818161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12818161 is an equidigital number, since it uses as much as digits as its factorization.

12818161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 28.

The square root of 12818161 is about 3580.2459412728. The cubic root of 12818161 is about 234.0319982054.

Adding to 12818161 its reverse (16181821), we get a palindrome (28999982).

The spelling of 12818161 in words is "twelve million, eight hundred eighteen thousand, one hundred sixty-one".