989870009 has 2 divisors, whose sum is σ = 989870010. Its totient is φ = 989870008.

The previous prime is 989870003. The next prime is 989870023. The reversal of 989870009 is 900078989.

989870009 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., 800890000 + 188980009 = 28300^2 + 13747^2 .

It is a cyclic number.

It is not a de Polignac number, because 989870009 - 2¹² = 989865913 is a prime.

It is not a weakly prime, because it can be changed into another prime (989870003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494935004 + 494935005.

It is an arithmetic number, because the mean of its divisors is an integer number (494935005).

Almost surely, 2^989870009 is an apocalyptic number.

It is an amenable number.

989870009 is a deficient number, since it is larger than the sum of its proper divisors (1).

989870009 is an equidigital number, since it uses as much as digits as its factorization.

989870009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 989870009 is about 31462.1996847010. The cubic root of 989870009 is about 996.6118698722.

The spelling of 989870009 in words is "nine hundred eighty-nine million, eight hundred seventy thousand, nine".