9991103 has 4 divisors (see below), whose sum is σ = 10088208. Its totient is φ = 9894000.

The previous prime is 9991067. The next prime is 9991123. The reversal of 9991103 is 3011999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3011999 = 313 ⋅9623.

It is a cyclic number.

It is not a de Polignac number, because 9991103 - 2⁸ = 9990847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9991103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991123) 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, 48398 + ... + 48603.

It is an arithmetic number, because the mean of its divisors is an integer number (2522052).

Almost surely, 2^9991103 is an apocalyptic number.

9991103 is a deficient number, since it is larger than the sum of its proper divisors (97105).

9991103 is a wasteful number, since it uses less digits than its factorization.

9991103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97104.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 9991103 is about 3160.8706079180. The cubic root of 9991103 is about 215.3795566937.

The spelling of 9991103 in words is "nine million, nine hundred ninety-one thousand, one hundred three".