289898981 has 2 divisors, whose sum is σ = 289898982. Its totient is φ = 289898980.

The previous prime is 289898971. The next prime is 289899007. The reversal of 289898981 is 189898982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289306081 + 592900 = 17009^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 289898981 - 2¹⁴ = 289882597 is a prime.

It is a super-2 number, since 2×289898981² = 168082838369676722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289898971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144949490 + 144949491.

It is an arithmetic number, because the mean of its divisors is an integer number (144949491).

Almost surely, 2^289898981 is an apocalyptic number.

It is an amenable number.

289898981 is a deficient number, since it is larger than the sum of its proper divisors (1).

289898981 is an equidigital number, since it uses as much as digits as its factorization.

289898981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 62.

The square root of 289898981 is about 17026.4200876168. The cubic root of 289898981 is about 661.8337289269.

Subtracting from 289898981 its reverse (189898982), we obtain a palindrome (99999999).

The spelling of 289898981 in words is "two hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred eighty-one".