268918591 has 2 divisors, whose sum is σ = 268918592. Its totient is φ = 268918590.

The previous prime is 268918579. The next prime is 268918621. The reversal of 268918591 is 195819862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 268918591 - 2¹⁵ = 268885823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268918891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134459295 + 134459296.

It is an arithmetic number, because the mean of its divisors is an integer number (134459296).

Almost surely, 2^268918591 is an apocalyptic number.

268918591 is a deficient number, since it is larger than the sum of its proper divisors (1).

268918591 is an equidigital number, since it uses as much as digits as its factorization.

268918591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 49.

The square root of 268918591 is about 16398.7374818917. The cubic root of 268918591 is about 645.4663542356.

The spelling of 268918591 in words is "two hundred sixty-eight million, nine hundred eighteen thousand, five hundred ninety-one".