12129251 has 2 divisors, whose sum is σ = 12129252. Its totient is φ = 12129250.

The previous prime is 12129233. The next prime is 12129259. The reversal of 12129251 is 15292121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12129251 - 2¹⁰ = 12128227 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12129259) 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, 6064625 + 6064626.

It is an arithmetic number, because the mean of its divisors is an integer number (6064626).

Almost surely, 2^12129251 is an apocalyptic number.

12129251 is a deficient number, since it is larger than the sum of its proper divisors (1).

12129251 is an equidigital number, since it uses as much as digits as its factorization.

12129251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 12129251 is about 3482.7074238299. The cubic root of 12129251 is about 229.7618896843.

The spelling of 12129251 in words is "twelve million, one hundred twenty-nine thousand, two hundred fifty-one".