268888691 has 2 divisors, whose sum is σ = 268888692. Its totient is φ = 268888690.

The previous prime is 268888681. The next prime is 268888723. The reversal of 268888691 is 196888862.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268888691 is a prime.

It is a super-2 number, since 2×268888691² = 144602256295386962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (268888651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134444345 + 134444346.

It is an arithmetic number, because the mean of its divisors is an integer number (134444346).

Almost surely, 2^268888691 is an apocalyptic number.

268888691 is a deficient number, since it is larger than the sum of its proper divisors (1).

268888691 is an equidigital number, since it uses as much as digits as its factorization.

268888691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 56.

The square root of 268888691 is about 16397.8258010018. The cubic root of 268888691 is about 645.4424310609.

The spelling of 268888691 in words is "two hundred sixty-eight million, eight hundred eighty-eight thousand, six hundred ninety-one".