899910009 has 6 divisors (see below), whose sum is σ = 1299870026. Its totient is φ = 599940000.

The previous prime is 899910001. The next prime is 899910013. The reversal of 899910009 is 900019998.

It can be written as a sum of positive squares in only one way, i.e., 899820009 + 90000 = 29997^2 + 300^2 .

It is not a de Polignac number, because 899910009 - 2³ = 899910001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (899910001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49994992 + ... + 49995009.

Almost surely, 2^899910009 is an apocalyptic number.

It is an amenable number.

899910009 is a deficient number, since it is larger than the sum of its proper divisors (399960017).

899910009 is a wasteful number, since it uses less digits than its factorization.

899910009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99990007 (or 99990004 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 899910009 is about 29998.5001125056. The cubic root of 899910009 is about 965.4572037718.

The spelling of 899910009 in words is "eight hundred ninety-nine million, nine hundred ten thousand, nine".