9989911 has 4 divisors (see below), whose sum is σ = 10020424.
Its totient is φ = 9959400.
The previous prime is 9989899. The next prime is 9989921. The reversal of 9989911 is 1199899.
9989911 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 9989911 - 25 = 9989879 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9989921) 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 in 3 ways as a sum of consecutive naturals, for example, 14760 + ... + 15421.
It is an arithmetic number, because the mean of its divisors is an integer number (2505106).
Almost surely, 29989911 is an apocalyptic number.
9989911 is the 1414-th centered decagonal number.
9989911 is a deficient number, since it is larger than the sum of its proper divisors (30513).
9989911 is a wasteful number, since it uses less digits than its factorization.
9989911 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 30512.
The product of its digits is 52488, while the sum is 46.
The square root of 9989911 is about 3160.6820466475.
The cubic root of 9989911 is about 215.3709909847.
The spelling of 9989911 in words is "nine million, nine hundred eighty-nine thousand, nine hundred eleven".