989484989 has 2 divisors, whose sum is σ = 989484990. Its totient is φ = 989484988.

The previous prime is 989484973. The next prime is 989485129.

989484989 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843437764 + 146047225 = 29042^2 + 12085^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989484989 - 2⁴ = 989484973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989484919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494742494 + 494742495.

It is an arithmetic number, because the mean of its divisors is an integer number (494742495).

Almost surely, 2^989484989 is an apocalyptic number.

It is an amenable number.

989484989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989484989 is an equidigital number, since it uses as much as digits as its factorization.

989484989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53747712, while the sum is 68.

The square root of 989484989 is about 31456.0803184376. The cubic root of 989484989 is about 996.4826390104.

The spelling of 989484989 in words is "nine hundred eighty-nine million, four hundred eighty-four thousand, nine hundred eighty-nine".