266489 has 2 divisors, whose sum is σ = 266490. Its totient is φ = 266488.

The previous prime is 266479. The next prime is 266491. The reversal of 266489 is 984662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218089 + 48400 = 467^2 + 220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266489 is a prime.

Together with 266491, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁹ + 6⁴ + 4⁹ + 6⁴ + 8³ + 9³ .

It is not a weakly prime, because it can be changed into another prime (266449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133244 + 133245.

It is an arithmetic number, because the mean of its divisors is an integer number (133245).

2²⁶⁶⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

266489 is a deficient number, since it is larger than the sum of its proper divisors (1).

266489 is an equidigital number, since it uses as much as digits as its factorization.

266489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 266489 is about 516.2257258216. The cubic root of 266489 is about 64.3516611912.

The spelling of 266489 in words is "two hundred sixty-six thousand, four hundred eighty-nine".