8991009 has 12 divisors (see below), whose sum is σ = 13670800. Its totient is φ = 5678424.

The previous prime is 8991007. The next prime is 8991029. The reversal of 8991009 is 9001998.

It is not a de Polignac number, because 8991009 - 2¹ = 8991007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991001) 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, 26119 + ... + 26460.

Almost surely, 2^8991009 is an apocalyptic number.

It is an amenable number.

8991009 is a deficient number, since it is larger than the sum of its proper divisors (4679791).

8991009 is a wasteful number, since it uses less digits than its factorization.

8991009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52604 (or 52601 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 8991009 is about 2998.5011255626. The cubic root of 8991009 is about 207.9390924352.

The spelling of 8991009 in words is "eight million, nine hundred ninety-one thousand, nine".