299681 has 2 divisors, whose sum is σ = 299682. Its totient is φ = 299680.

The previous prime is 299671. The next prime is 299683. The reversal of 299681 is 186992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286225 + 13456 = 535^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 299681 - 2⁶ = 299617 is a prime.

It is a super-2 number, since 2×299681² = 179617403522, which contains 22 as substring.

Together with 299683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (299683) 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, 149840 + 149841.

It is an arithmetic number, because the mean of its divisors is an integer number (149841).

2²⁹⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

299681 is a deficient number, since it is larger than the sum of its proper divisors (1).

299681 is an equidigital number, since it uses as much as digits as its factorization.

299681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 299681 is about 547.4312742254. The cubic root of 299681 is about 66.9195589141.

The spelling of 299681 in words is "two hundred ninety-nine thousand, six hundred eighty-one".