8856991 has 16 divisors (see below), whose sum is σ = 10489248. Its totient is φ = 7372800.

The previous prime is 8856971. The next prime is 8856997. The reversal of 8856991 is 1996588.

It is a 15-Lehmer number, since φ(8856991) divides (8856991-1)¹⁵.

It is a cyclic number.

It is not a de Polignac number, because 8856991 - 2⁵ = 8856959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8856997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34335 + ... + 34591.

It is an arithmetic number, because the mean of its divisors is an integer number (655578).

Almost surely, 2^8856991 is an apocalyptic number.

8856991 is a deficient number, since it is larger than the sum of its proper divisors (1632257).

8856991 is a wasteful number, since it uses less digits than its factorization.

8856991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its digits is 155520, while the sum is 46.

The square root of 8856991 is about 2976.0697236456. The cubic root of 8856991 is about 206.9007513512.

The spelling of 8856991 in words is "eight million, eight hundred fifty-six thousand, nine hundred ninety-one".