266281 has 2 divisors, whose sum is σ = 266282. Its totient is φ = 266280.

The previous prime is 266269. The next prime is 266291. The reversal of 266281 is 182662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266256 + 25 = 516^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 266281 - 2⁷ = 266153 is a prime.

It is a super-2 number, since 2×266281² = 141811141922, which contains 22 as substring.

266281 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133140 + 133141.

It is an arithmetic number, because the mean of its divisors is an integer number (133141).

2²⁶⁶²⁸¹ is an apocalyptic number.

It is an amenable number.

266281 is a deficient number, since it is larger than the sum of its proper divisors (1).

266281 is an equidigital number, since it uses as much as digits as its factorization.

266281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 266281 is about 516.0242242376. The cubic root of 266281 is about 64.3349142467.

Subtracting from 266281 its sum of digits (25), we obtain a square (266256 = 516²).

It can be divided in two parts, 26 and 6281, that multiplied together give a triangular number (163306 = T₅₇₁).

The spelling of 266281 in words is "two hundred sixty-six thousand, two hundred eighty-one".