268388513 has 2 divisors, whose sum is σ = 268388514. Its totient is φ = 268388512.

The previous prime is 268388473. The next prime is 268388521. The reversal of 268388513 is 315883862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262666849 + 5721664 = 16207^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 268388513 - 2⁸ = 268388257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (268388543) 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, 134194256 + 134194257.

It is an arithmetic number, because the mean of its divisors is an integer number (134194257).

Almost surely, 2^268388513 is an apocalyptic number.

It is an amenable number.

268388513 is a deficient number, since it is larger than the sum of its proper divisors (1).

268388513 is an equidigital number, since it uses as much as digits as its factorization.

268388513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 44.

The square root of 268388513 is about 16382.5673506932. The cubic root of 268388513 is about 645.0419723102.

The spelling of 268388513 in words is "two hundred sixty-eight million, three hundred eighty-eight thousand, five hundred thirteen".