268709869 has 2 divisors, whose sum is σ = 268709870. Its totient is φ = 268709868.

The previous prime is 268709867. The next prime is 268709879. The reversal of 268709869 is 968907862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157828969 + 110880900 = 12563^2 + 10530^2 .

It is a cyclic number.

It is not a de Polignac number, because 268709869 - 2¹ = 268709867 is a prime.

It is a super-2 number, since 2×268709869² = 144409987395994322, which contains 22 as substring.

Together with 268709867, 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 (268709867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134354934 + 134354935.

It is an arithmetic number, because the mean of its divisors is an integer number (134354935).

Almost surely, 2^268709869 is an apocalyptic number.

It is an amenable number.

268709869 is a deficient number, since it is larger than the sum of its proper divisors (1).

268709869 is an equidigital number, since it uses as much as digits as its factorization.

268709869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 268709869 is about 16392.3722810336. The cubic root of 268709869 is about 645.2993174406.

The spelling of 268709869 in words is "two hundred sixty-eight million, seven hundred nine thousand, eight hundred sixty-nine".