268388521 has 2 divisors, whose sum is σ = 268388522. Its totient is φ = 268388520.

The previous prime is 268388513. The next prime is 268388531. The reversal of 268388521 is 125883862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181171600 + 87216921 = 13460^2 + 9339^2 .

It is a cyclic number.

It is not a de Polignac number, because 268388521 - 2³ = 268388513 is a prime.

It is not a weakly prime, because it can be changed into another prime (268388531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134194260 + 134194261.

It is an arithmetic number, because the mean of its divisors is an integer number (134194261).

Almost surely, 2^268388521 is an apocalyptic number.

It is an amenable number.

268388521 is a deficient number, since it is larger than the sum of its proper divisors (1).

268388521 is an equidigital number, since it uses as much as digits as its factorization.

268388521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 43.

The square root of 268388521 is about 16382.5675948552. The cubic root of 268388521 is about 645.0419787193.

It can be divided in two parts, 2683 and 88521, that added together give a square (91204 = 302²).

The spelling of 268388521 in words is "two hundred sixty-eight million, three hundred eighty-eight thousand, five hundred twenty-one".