9000999 has 12 divisors (see below), whose sum is σ = 14858896.
Its totient is φ = 5143392.
The previous prime is 9000997. The next prime is 9001001. The reversal of 9000999 is 9990009.
9000999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (9000997) and next prime (9001001).
It is not a de Polignac number, because 9000999 - 21 = 9000997 is a prime.
It is a Duffinian number.
9000999 is a modest number, since divided by 999 gives 9 as remainder.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9000997) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71374 + ... + 71499.
Almost surely, 29000999 is an apocalyptic number.
9000999 is a deficient number, since it is larger than the sum of its proper divisors (5857897).
9000999 is a wasteful number, since it uses less digits than its factorization.
9000999 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 142886 (or 142883 counting only the distinct ones).
The product of its (nonzero) digits is 6561, while the sum is 36.
The square root of 9000999 is about 3000.1664953799.
The cubic root of 9000999 is about 208.0160783306.
The spelling of 9000999 in words is "nine million, nine hundred ninety-nine", and is thus an aban number.