9991075 has 6 divisors (see below), whose sum is σ = 12388964. Its totient is φ = 7992840.

The previous prime is 9991067. The next prime is 9991123. The reversal of 9991075 is 5701999.

9991075 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9991075 - 2³ = 9991067 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199797 + ... + 199846.

Almost surely, 2^9991075 is an apocalyptic number.

9991075 is a deficient number, since it is larger than the sum of its proper divisors (2397889).

9991075 is a wasteful number, since it uses less digits than its factorization.

9991075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399653 (or 399648 counting only the distinct ones).

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 9991075 is about 3160.8661787554. The cubic root of 9991075 is about 215.3793554936.

The spelling of 9991075 in words is "nine million, nine hundred ninety-one thousand, seventy-five".