268968209 has 2 divisors, whose sum is σ = 268968210. Its totient is φ = 268968208.

The previous prime is 268968191. The next prime is 268968211. The reversal of 268968209 is 902869862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187607809 + 81360400 = 13697^2 + 9020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268968209 is a prime.

Together with 268968211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (268968239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134484104 + 134484105.

It is an arithmetic number, because the mean of its divisors is an integer number (134484105).

Almost surely, 2^268968209 is an apocalyptic number.

It is an amenable number.

268968209 is a deficient number, since it is larger than the sum of its proper divisors (1).

268968209 is an equidigital number, since it uses as much as digits as its factorization.

268968209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 268968209 is about 16400.2502724806. The cubic root of 268968209 is about 645.5060499913.

The spelling of 268968209 in words is "two hundred sixty-eight million, nine hundred sixty-eight thousand, two hundred nine".