998459989 has 2 divisors, whose sum is σ = 998459990. Its totient is φ = 998459988.

The previous prime is 998459981. The next prime is 998460011. The reversal of 998459989 is 989954899.

998459989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 865242225 + 133217764 = 29415^2 + 11542^2 .

It is a cyclic number.

It is not a de Polignac number, because 998459989 - 2³ = 998459981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998459981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499229994 + 499229995.

It is an arithmetic number, because the mean of its divisors is an integer number (499229995).

Almost surely, 2^998459989 is an apocalyptic number.

It is an amenable number.

998459989 is a deficient number, since it is larger than the sum of its proper divisors (1).

998459989 is an equidigital number, since it uses as much as digits as its factorization.

998459989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75582720, while the sum is 70.

The square root of 998459989 is about 31598.4175078436. The cubic root of 998459989 is about 999.4863992594.

The spelling of 998459989 in words is "nine hundred ninety-eight million, four hundred fifty-nine thousand, nine hundred eighty-nine".