12111811 has 2 divisors, whose sum is σ = 12111812. Its totient is φ = 12111810.

The previous prime is 12111787. The next prime is 12111817. The reversal of 12111811 is 11811121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12111811 - 2⁵ = 12111779 is a prime.

It is a zygodrome in base 6.

It is not a weakly prime, because it can be changed into another prime (12111817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055905 + 6055906.

It is an arithmetic number, because the mean of its divisors is an integer number (6055906).

Almost surely, 2^12111811 is an apocalyptic number.

12111811 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111811 is an equidigital number, since it uses as much as digits as its factorization.

12111811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 16.

The square root of 12111811 is about 3480.2027239803. The cubic root of 12111811 is about 229.6517160938.

Adding to 12111811 its reverse (11811121), we get a palindrome (23922932).

The spelling of 12111811 in words is "twelve million, one hundred eleven thousand, eight hundred eleven".