298868821 has 2 divisors, whose sum is σ = 298868822. Its totient is φ = 298868820.

The previous prime is 298868743. The next prime is 298868851. The reversal of 298868821 is 128868892.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256800625 + 42068196 = 16025^2 + 6486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-298868821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (298868851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149434410 + 149434411.

It is an arithmetic number, because the mean of its divisors is an integer number (149434411).

Almost surely, 2^298868821 is an apocalyptic number.

It is an amenable number.

298868821 is a deficient number, since it is larger than the sum of its proper divisors (1).

298868821 is an equidigital number, since it uses as much as digits as its factorization.

298868821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 52.

The square root of 298868821 is about 17287.8229109394. The cubic root of 298868821 is about 668.5905031340.

The spelling of 298868821 in words is "two hundred ninety-eight million, eight hundred sixty-eight thousand, eight hundred twenty-one".