8855991 has 12 divisors (see below), whose sum is σ = 13233480. Its totient is φ = 5700240.

The previous prime is 8855981. The next prime is 8856019. The reversal of 8855991 is 1995588.

8855991 is a `hidden beast` number, since 8 + 8 + 559 + 91 = 666.

8855991 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8855991 - 2⁶ = 8855927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8855911) 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, 16705 + ... + 17226.

It is an arithmetic number, because the mean of its divisors is an integer number (1102790).

Almost surely, 2^8855991 is an apocalyptic number.

8855991 is a deficient number, since it is larger than the sum of its proper divisors (4377489).

8855991 is a wasteful number, since it uses less digits than its factorization.

8855991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33966 (or 33963 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 8855991 is about 2975.9017120866. The cubic root of 8855991 is about 206.8929643372.

It can be divided in two parts, 885 and 5991, that multiplied together give a palindrome (5302035).

The spelling of 8855991 in words is "eight million, eight hundred fifty-five thousand, nine hundred ninety-one".