268806491 has 2 divisors, whose sum is σ = 268806492. Its totient is φ = 268806490.

The previous prime is 268806457. The next prime is 268806521. The reversal of 268806491 is 194608862.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268806491 - 2¹⁴ = 268790107 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (268856491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134403245 + 134403246.

It is an arithmetic number, because the mean of its divisors is an integer number (134403246).

Almost surely, 2^268806491 is an apocalyptic number.

268806491 is a deficient number, since it is larger than the sum of its proper divisors (1).

268806491 is an equidigital number, since it uses as much as digits as its factorization.

268806491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 268806491 is about 16395.3191795707. The cubic root of 268806491 is about 645.3766531921.

The spelling of 268806491 in words is "two hundred sixty-eight million, eight hundred six thousand, four hundred ninety-one".