268918009 has 2 divisors, whose sum is σ = 268918010. Its totient is φ = 268918008.

The previous prime is 268918003. The next prime is 268918043. The reversal of 268918009 is 900819862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223652025 + 45265984 = 14955^2 + 6728^2 .

It is a cyclic number.

It is not a de Polignac number, because 268918009 - 2¹¹ = 268915961 is a prime.

It is not a weakly prime, because it can be changed into another prime (268918003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134459004 + 134459005.

It is an arithmetic number, because the mean of its divisors is an integer number (134459005).

Almost surely, 2^268918009 is an apocalyptic number.

It is an amenable number.

268918009 is a deficient number, since it is larger than the sum of its proper divisors (1).

268918009 is an equidigital number, since it uses as much as digits as its factorization.

268918009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 268918009 is about 16398.7197366136. The cubic root of 268918009 is about 645.4658885908.

The spelling of 268918009 in words is "two hundred sixty-eight million, nine hundred eighteen thousand, nine".