299809981 has 2 divisors, whose sum is σ = 299809982. Its totient is φ = 299809980.

The previous prime is 299809969. The next prime is 299809997. The reversal of 299809981 is 189908992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204747481 + 95062500 = 14309^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 299809981 - 2⁹ = 299809469 is a prime.

It is a super-2 number, since 2×299809981² = 179772049414440722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (299806981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149904990 + 149904991.

It is an arithmetic number, because the mean of its divisors is an integer number (149904991).

Almost surely, 2^299809981 is an apocalyptic number.

It is an amenable number.

299809981 is a deficient number, since it is larger than the sum of its proper divisors (1).

299809981 is an equidigital number, since it uses as much as digits as its factorization.

299809981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 55.

The square root of 299809981 is about 17315.0218307688. The cubic root of 299809981 is about 669.2915813641.

The spelling of 299809981 in words is "two hundred ninety-nine million, eight hundred nine thousand, nine hundred eighty-one".