268000309 has 2 divisors, whose sum is σ = 268000310. Its totient is φ = 268000308.

The previous prime is 268000307. The next prime is 268000331. The reversal of 268000309 is 903000862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267976900 + 23409 = 16370^2 + 153^2 .

It is a cyclic number.

It is not a de Polignac number, because 268000309 - 2¹ = 268000307 is a prime.

Together with 268000307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268000307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134000154 + 134000155.

It is an arithmetic number, because the mean of its divisors is an integer number (134000155).

Almost surely, 2^268000309 is an apocalyptic number.

It is an amenable number.

268000309 is a deficient number, since it is larger than the sum of its proper divisors (1).

268000309 is an equidigital number, since it uses as much as digits as its factorization.

268000309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 268000309 is about 16370.7149813318. The cubic root of 268000309 is about 644.7308205148.

The spelling of 268000309 in words is "two hundred sixty-eight million, three hundred nine", and thus it is an aban number.