268978243 has 2 divisors, whose sum is σ = 268978244. Its totient is φ = 268978242.

The previous prime is 268978223. The next prime is 268978247. The reversal of 268978243 is 342879862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268978243 - 2¹⁷ = 268847171 is a prime.

It is not a weakly prime, because it can be changed into another prime (268978247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134489121 + 134489122.

It is an arithmetic number, because the mean of its divisors is an integer number (134489122).

Almost surely, 2^268978243 is an apocalyptic number.

268978243 is a deficient number, since it is larger than the sum of its proper divisors (1).

268978243 is an equidigital number, since it uses as much as digits as its factorization.

268978243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 268978243 is about 16400.5561795934. The cubic root of 268978243 is about 645.5140768719.

The spelling of 268978243 in words is "two hundred sixty-eight million, nine hundred seventy-eight thousand, two hundred forty-three".