268505521 has 2 divisors, whose sum is σ = 268505522. Its totient is φ = 268505520.

The previous prime is 268505513. The next prime is 268505537. The reversal of 268505521 is 125505862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143065521 + 125440000 = 11961^2 + 11200^2 .

It is a cyclic number.

It is not a de Polignac number, because 268505521 - 2³ = 268505513 is a prime.

It is not a weakly prime, because it can be changed into another prime (268505561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134252760 + 134252761.

It is an arithmetic number, because the mean of its divisors is an integer number (134252761).

Almost surely, 2^268505521 is an apocalyptic number.

It is an amenable number.

268505521 is a deficient number, since it is larger than the sum of its proper divisors (1).

268505521 is an equidigital number, since it uses as much as digits as its factorization.

268505521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 268505521 is about 16386.1380746044. The cubic root of 268505521 is about 645.1356972673.

The spelling of 268505521 in words is "two hundred sixty-eight million, five hundred five thousand, five hundred twenty-one".