8991133 has 4 divisors (see below), whose sum is σ = 9016000. Its totient is φ = 8966268.

The previous prime is 8991127. The next prime is 8991139. The reversal of 8991133 is 3311998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3311998 = 2 ⋅1655999.

It is an interprime number because it is at equal distance from previous prime (8991127) and next prime (8991139).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8991133 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 (8991139) 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 3 ways as a sum of consecutive naturals, for example, 11883 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (2254000).

Almost surely, 2^8991133 is an apocalyptic number.

It is an amenable number.

8991133 is a deficient number, since it is larger than the sum of its proper divisors (24867).

8991133 is a wasteful number, since it uses less digits than its factorization.

8991133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24866.

The product of its digits is 5832, while the sum is 34.

The square root of 8991133 is about 2998.5218024887. The cubic root of 8991133 is about 207.9400483654.

The spelling of 8991133 in words is "eight million, nine hundred ninety-one thousand, one hundred thirty-three".