9001809 has 12 divisors (see below), whose sum is σ = 13568256. Its totient is φ = 5740152.

The previous prime is 9001799. The next prime is 9001829. The reversal of 9001809 is 9081009.

It is not a de Polignac number, because 9001809 - 2⁴ = 9001793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9001829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21537 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (1130688).

Almost surely, 2^9001809 is an apocalyptic number.

It is an amenable number.

9001809 is a deficient number, since it is larger than the sum of its proper divisors (4566447).

9001809 is a wasteful number, since it uses less digits than its factorization.

9001809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43516 (or 43513 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 9001809 is about 3000.3014848511. The cubic root of 9001809 is about 208.0223179332.

The spelling of 9001809 in words is "nine million, one thousand, eight hundred nine".