9999081 has 12 divisors (see below), whose sum is σ = 14909440. Its totient is φ = 6450840.

The previous prime is 9999071. The next prime is 9999083. The reversal of 9999081 is 1809999.

It is not a de Polignac number, because 9999081 - 2⁵ = 9999049 is a prime.

It is a super-2 number, since 2×9999081² = 199963241689122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999083) 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, 17641 + ... + 18198.

Almost surely, 2^9999081 is an apocalyptic number.

It is an amenable number.

9999081 is a deficient number, since it is larger than the sum of its proper divisors (4910359).

9999081 is a wasteful number, since it uses less digits than its factorization.

9999081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35876 (or 35873 counting only the distinct ones).

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

The square root of 9999081 is about 3162.1323501713. The cubic root of 9999081 is about 215.4368690494.

The spelling of 9999081 in words is "nine million, nine hundred ninety-nine thousand, eighty-one".