9981899 has 2 divisors, whose sum is σ = 9981900.
Its totient is φ = 9981898.
The previous prime is 9981889. The next prime is 9981911.
9981899 is nontrivially palindromic in base 10.
It is a weak prime.
It is a palprime.
It is a cyclic number.
It is not a de Polignac number, because 9981899 - 216 = 9916363 is a prime.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 9981899.
It is not a weakly prime, because it can be changed into another prime (9981809) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990949 + 4990950.
It is an arithmetic number, because the mean of its divisors is an integer number (4990950).
Almost surely, 29981899 is an apocalyptic number.
9981899 is a deficient number, since it is larger than the sum of its proper divisors (1).
9981899 is an equidigital number, since it uses as much as digits as its factorization.
9981899 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 419904, while the sum is 53.
The square root of 9981899 is about 3159.4143444632.
The cubic root of 9981899 is about 215.3133990840.
The spelling of 9981899 in words is "nine million, nine hundred eighty-one thousand, eight hundred ninety-nine".