8991137 has 8 divisors (see below), whose sum is σ = 9429504. Its totient is φ = 8556768.

The previous prime is 8991127. The next prime is 8991139. The reversal of 8991137 is 7311998.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8991137 - 2⁸ = 8990881 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 8991137.

It is not an unprimeable number, because it can be changed into a prime (8991139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4253 + ... + 6005.

It is an arithmetic number, because the mean of its divisors is an integer number (1178688).

Almost surely, 2^8991137 is an apocalyptic number.

It is an amenable number.

8991137 is a deficient number, since it is larger than the sum of its proper divisors (438367).

8991137 is a wasteful number, since it uses less digits than its factorization.

8991137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999.

The product of its digits is 13608, while the sum is 38.

The square root of 8991137 is about 2998.5224694839. The cubic root of 8991137 is about 207.9400792017.

The spelling of 8991137 in words is "eight million, nine hundred ninety-one thousand, one hundred thirty-seven".