989898997 has 2 divisors, whose sum is σ = 989898998.
Its totient is φ = 989898996.
The previous prime is 989898989. The next prime is 989899091. The reversal of 989898997 is 799898989.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 687173796 + 302725201 = 26214^2 + 17399^2
It is a cyclic number.
It is not a de Polignac number, because 989898997 - 23 = 989898989 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (989898197) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949498 + 494949499.
It is an arithmetic number, because the mean of its divisors is an integer number (494949499).
Almost surely, 2989898997 is an apocalyptic number.
It is an amenable number.
989898997 is a deficient number, since it is larger than the sum of its proper divisors (1).
989898997 is an equidigital number, since it uses as much as digits as its factorization.
989898997 is an evil number, because the sum of its binary digits is even.
The product of its digits is 211631616, while the sum is 76.
The square root of 989898997 is about 31462.6603611328.
The cubic root of 989898997 is about 996.6215982549.
The spelling of 989898997 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred ninety-seven".