266241389 has 2 divisors, whose sum is σ = 266241390. Its totient is φ = 266241388.

The previous prime is 266241383. The next prime is 266241397. The reversal of 266241389 is 983142662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151044100 + 115197289 = 12290^2 + 10733^2 .

It is a cyclic number.

It is not a de Polignac number, because 266241389 - 2¹⁶ = 266175853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266241383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133120694 + 133120695.

It is an arithmetic number, because the mean of its divisors is an integer number (133120695).

Almost surely, 2^266241389 is an apocalyptic number.

It is an amenable number.

266241389 is a deficient number, since it is larger than the sum of its proper divisors (1).

266241389 is an equidigital number, since it uses as much as digits as its factorization.

266241389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 266241389 is about 16316.9050067714. The cubic root of 266241389 is about 643.3172401199.

The spelling of 266241389 in words is "two hundred sixty-six million, two hundred forty-one thousand, three hundred eighty-nine".