266872121 has 2 divisors, whose sum is σ = 266872122. Its totient is φ = 266872120.

The previous prime is 266872117. The next prime is 266872127. The reversal of 266872121 is 121278662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266864896 + 7225 = 16336^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 266872121 - 2² = 266872117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (266872127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133436060 + 133436061.

It is an arithmetic number, because the mean of its divisors is an integer number (133436061).

Almost surely, 2^266872121 is an apocalyptic number.

It is an amenable number.

266872121 is a deficient number, since it is larger than the sum of its proper divisors (1).

266872121 is an equidigital number, since it uses as much as digits as its factorization.

266872121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 266872121 is about 16336.2211358686. The cubic root of 266872121 is about 643.8248506173.

The spelling of 266872121 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, one hundred twenty-one".