266872129 has 2 divisors, whose sum is σ = 266872130. Its totient is φ = 266872128.

The previous prime is 266872127. The next prime is 266872153. The reversal of 266872129 is 921278662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263185729 + 3686400 = 16223^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 266872129 - 2¹ = 266872127 is a prime.

Together with 266872127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (266872121) 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, 133436064 + 133436065.

It is an arithmetic number, because the mean of its divisors is an integer number (133436065).

Almost surely, 2^266872129 is an apocalyptic number.

It is an amenable number.

266872129 is a deficient number, since it is larger than the sum of its proper divisors (1).

266872129 is an equidigital number, since it uses as much as digits as its factorization.

266872129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 266872129 is about 16336.2213807233. The cubic root of 266872129 is about 643.8248570506.

The spelling of 266872129 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, one hundred twenty-nine".