9909004085 has 4 divisors (see below), whose sum is σ = 11890804908. Its totient is φ = 7927203264.

The previous prime is 9909004043. The next prime is 9909004087. The reversal of 9909004085 is 5804009099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5804009099 = 7 ⋅829144157.

It can be written as a sum of positive squares in 2 ways, for example, as 6115552804 + 3793451281 = 78202^2 + 61591^2 .

It is a cyclic number.

It is not a de Polignac number, because 9909004085 - 2²⁰ = 9907955509 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 (9909004087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990900404 + ... + 990900413.

It is an arithmetic number, because the mean of its divisors is an integer number (2972701227).

Almost surely, 2^9909004085 is an apocalyptic number.

It is an amenable number.

9909004085 is a deficient number, since it is larger than the sum of its proper divisors (1981800823).

9909004085 is a wasteful number, since it uses less digits than its factorization.

9909004085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981800822.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 9909004085 is about 99543.9806567931. The cubic root of 9909004085 is about 2147.8799426053.

The spelling of 9909004085 in words is "nine billion, nine hundred nine million, four thousand, eighty-five".