266841391 has 2 divisors, whose sum is σ = 266841392. Its totient is φ = 266841390.

The previous prime is 266841347. The next prime is 266841427. The reversal of 266841391 is 193148662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266841391 - 2¹¹ = 266839343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266847391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133420695 + 133420696.

It is an arithmetic number, because the mean of its divisors is an integer number (133420696).

Almost surely, 2^266841391 is an apocalyptic number.

266841391 is a deficient number, since it is larger than the sum of its proper divisors (1).

266841391 is an equidigital number, since it uses as much as digits as its factorization.

266841391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 266841391 is about 16335.2805607985. The cubic root of 266841391 is about 643.8001377860.

The spelling of 266841391 in words is "two hundred sixty-six million, eight hundred forty-one thousand, three hundred ninety-one".