8991117 has 12 divisors (see below), whose sum is σ = 13029120. Its totient is φ = 5974728.

The previous prime is 8991097. The next prime is 8991127. The reversal of 8991117 is 7111998.

It is not a de Polignac number, because 8991117 - 2¹¹ = 8989069 is a prime.

8991117 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8991127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1684 + ... + 4562.

It is an arithmetic number, because the mean of its divisors is an integer number (1085760).

Almost surely, 2^8991117 is an apocalyptic number.

It is an amenable number.

8991117 is a deficient number, since it is larger than the sum of its proper divisors (4038003).

8991117 is a wasteful number, since it uses less digits than its factorization.

8991117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232 (or 3229 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 8991117 is about 2998.5191345062. The cubic root of 8991117 is about 207.9399250200.

It can be divided in two parts, 899 and 1117, that added together give a triangular number (2016 = T₆₃).

The spelling of 8991117 in words is "eight million, nine hundred ninety-one thousand, one hundred seventeen".