268865549 has 2 divisors, whose sum is σ = 268865550. Its totient is φ = 268865548.

The previous prime is 268865539. The next prime is 268865551. The reversal of 268865549 is 945568862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254562025 + 14303524 = 15955^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 268865549 - 2²⁰ = 267816973 is a prime.

Together with 268865551, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268865549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268865539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134432774 + 134432775.

It is an arithmetic number, because the mean of its divisors is an integer number (134432775).

Almost surely, 2^268865549 is an apocalyptic number.

It is an amenable number.

268865549 is a deficient number, since it is larger than the sum of its proper divisors (1).

268865549 is an equidigital number, since it uses as much as digits as its factorization.

268865549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 53.

The square root of 268865549 is about 16397.1201434886. The cubic root of 268865549 is about 645.4239137862.

The spelling of 268865549 in words is "two hundred sixty-eight million, eight hundred sixty-five thousand, five hundred forty-nine".