268211491 has 2 divisors, whose sum is σ = 268211492. Its totient is φ = 268211490.

The previous prime is 268211479. The next prime is 268211507. The reversal of 268211491 is 194112862.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 268211491 - 2¹¹ = 268209443 is a prime.

It is not a weakly prime, because it can be changed into another prime (268211191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134105745 + 134105746.

It is an arithmetic number, because the mean of its divisors is an integer number (134105746).

Almost surely, 2^268211491 is an apocalyptic number.

268211491 is a deficient number, since it is larger than the sum of its proper divisors (1).

268211491 is an equidigital number, since it uses as much as digits as its factorization.

268211491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 268211491 is about 16377.1637043781. The cubic root of 268211491 is about 644.9001235493.

The spelling of 268211491 in words is "two hundred sixty-eight million, two hundred eleven thousand, four hundred ninety-one".