266271521 has 2 divisors, whose sum is σ = 266271522. Its totient is φ = 266271520.

The previous prime is 266271487. The next prime is 266271539. The reversal of 266271521 is 125172662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169937296 + 96334225 = 13036^2 + 9815^2 .

It is a cyclic number.

It is not a de Polignac number, because 266271521 - 2¹⁰ = 266270497 is a prime.

It is not a weakly prime, because it can be changed into another prime (266271541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133135760 + 133135761.

It is an arithmetic number, because the mean of its divisors is an integer number (133135761).

Almost surely, 2^266271521 is an apocalyptic number.

It is an amenable number.

266271521 is a deficient number, since it is larger than the sum of its proper divisors (1).

266271521 is an equidigital number, since it uses as much as digits as its factorization.

266271521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 266271521 is about 16317.8283175182. The cubic root of 266271521 is about 643.3415084526.

The spelling of 266271521 in words is "two hundred sixty-six million, two hundred seventy-one thousand, five hundred twenty-one".