989868989 has 2 divisors, whose sum is σ = 989868990. Its totient is φ = 989868988.

The previous prime is 989868959. The next prime is 989868991.

989868989 is nontrivially palindromic in base 10.

989868989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512796025 + 477072964 = 22645^2 + 21842^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989868989 - 2²⁴ = 973091773 is a prime.

Together with 989868991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989868959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494934494 + 494934495.

It is an arithmetic number, because the mean of its divisors is an integer number (494934495).

Almost surely, 2^989868989 is an apocalyptic number.

It is an amenable number.

989868989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989868989 is an equidigital number, since it uses as much as digits as its factorization.

989868989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161243136, while the sum is 74.

The square root of 989868989 is about 31462.1834747686. The cubic root of 989868989 is about 996.6115275564.

It can be divided in two parts, 9898 and 68989, that added together give a palindrome (78887).

The spelling of 989868989 in words is "nine hundred eighty-nine million, eight hundred sixty-eight thousand, nine hundred eighty-nine".