268676921 has 2 divisors, whose sum is σ = 268676922. Its totient is φ = 268676920.

The previous prime is 268676899. The next prime is 268676923. The reversal of 268676921 is 129676862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216678400 + 51998521 = 14720^2 + 7211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268676921 is a prime.

Together with 268676923, 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 (268676923) 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, 134338460 + 134338461.

It is an arithmetic number, because the mean of its divisors is an integer number (134338461).

Almost surely, 2^268676921 is an apocalyptic number.

It is an amenable number.

268676921 is a deficient number, since it is larger than the sum of its proper divisors (1).

268676921 is an equidigital number, since it uses as much as digits as its factorization.

268676921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 268676921 is about 16391.3672706092. The cubic root of 268676921 is about 645.2729417924.

The spelling of 268676921 in words is "two hundred sixty-eight million, six hundred seventy-six thousand, nine hundred twenty-one".