268999681 has 2 divisors, whose sum is σ = 268999682. Its totient is φ = 268999680.

The previous prime is 268999673. The next prime is 268999699. The reversal of 268999681 is 186999862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215943025 + 53056656 = 14695^2 + 7284^2 .

It is a cyclic number.

It is not a de Polignac number, because 268999681 - 2³ = 268999673 is a prime.

It is a super-2 number, since 2×268999681² = 144721656756203522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268999631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134499840 + 134499841.

It is an arithmetic number, because the mean of its divisors is an integer number (134499841).

Almost surely, 2^268999681 is an apocalyptic number.

It is an amenable number.

268999681 is a deficient number, since it is larger than the sum of its proper divisors (1).

268999681 is an equidigital number, since it uses as much as digits as its factorization.

268999681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 58.

The square root of 268999681 is about 16401.2097419672. The cubic root of 268999681 is about 645.5312259209.

The spelling of 268999681 in words is "two hundred sixty-eight million, nine hundred ninety-nine thousand, six hundred eighty-one".