9991135 has 16 divisors (see below), whose sum is σ = 14948352. Its totient is φ = 6228000.

The previous prime is 9991133. The next prime is 9991139. The reversal of 9991135 is 5311999.

It is not a de Polignac number, because 9991135 - 2¹ = 9991133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9991094 and 9991103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12591 + ... + 13360.

It is an arithmetic number, because the mean of its divisors is an integer number (934272).

Almost surely, 2^9991135 is an apocalyptic number.

9991135 is a deficient number, since it is larger than the sum of its proper divisors (4957217).

9991135 is a wasteful number, since it uses less digits than its factorization.

9991135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25974.

The product of its digits is 10935, while the sum is 37.

The square root of 9991135 is about 3160.8756698105. The cubic root of 9991135 is about 215.3797866362.

The spelling of 9991135 in words is "nine million, nine hundred ninety-one thousand, one hundred thirty-five".