12129811 has 2 divisors, whose sum is σ = 12129812. Its totient is φ = 12129810.

The previous prime is 12129781. The next prime is 12129829. The reversal of 12129811 is 11892121.

It is a strong prime.

It is an emirp because it is prime and its reverse (11892121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12129811 - 2¹³ = 12121619 is a prime.

It is not a weakly prime, because it can be changed into another prime (12129851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064905 + 6064906.

It is an arithmetic number, because the mean of its divisors is an integer number (6064906).

Almost surely, 2^12129811 is an apocalyptic number.

12129811 is a deficient number, since it is larger than the sum of its proper divisors (1).

12129811 is an equidigital number, since it uses as much as digits as its factorization.

12129811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 25.

The square root of 12129811 is about 3482.7878201234. The cubic root of 12129811 is about 229.7654256179.

The spelling of 12129811 in words is "twelve million, one hundred twenty-nine thousand, eight hundred eleven".