268506809 has 2 divisors, whose sum is σ = 268506810. Its totient is φ = 268506808.

The previous prime is 268506773. The next prime is 268506839. The reversal of 268506809 is 908605862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228463225 + 40043584 = 15115^2 + 6328^2 .

It is a cyclic number.

It is not a de Polignac number, because 268506809 - 2²⁸ = 71353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268506809.

It is not a weakly prime, because it can be changed into another prime (268506839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134253404 + 134253405.

It is an arithmetic number, because the mean of its divisors is an integer number (134253405).

Almost surely, 2^268506809 is an apocalyptic number.

It is an amenable number.

268506809 is a deficient number, since it is larger than the sum of its proper divisors (1).

268506809 is an equidigital number, since it uses as much as digits as its factorization.

268506809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 268506809 is about 16386.1773760691. The cubic root of 268506809 is about 645.1367288208.

The spelling of 268506809 in words is "two hundred sixty-eight million, five hundred six thousand, eight hundred nine".