12111161 has 2 divisors, whose sum is σ = 12111162. Its totient is φ = 12111160.

The previous prime is 12111149. The next prime is 12111163. The reversal of 12111161 is 16111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7595536 + 4515625 = 2756^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111161 - 2⁶ = 12111097 is a prime.

Together with 12111163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12111163) 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, 6055580 + 6055581.

It is an arithmetic number, because the mean of its divisors is an integer number (6055581).

Almost surely, 2^12111161 is an apocalyptic number.

It is an amenable number.

12111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111161 is an equidigital number, since it uses as much as digits as its factorization.

12111161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 14.

The square root of 12111161 is about 3480.1093373628. The cubic root of 12111161 is about 229.6476078096.

Adding to 12111161 its reverse (16111121), we get a palindrome (28222282).

The spelling of 12111161 in words is "twelve million, one hundred eleven thousand, one hundred sixty-one".