8899891 has 32 divisors (see below), whose sum is σ = 12676608. Its totient is φ = 6013440.

The previous prime is 8899867. The next prime is 8899909. The reversal of 8899891 is 1989988.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8899891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8899801) 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 31 ways as a sum of consecutive naturals, for example, 16756 + ... + 17278.

It is an arithmetic number, because the mean of its divisors is an integer number (396144).

Almost surely, 2^8899891 is an apocalyptic number.

8899891 is a deficient number, since it is larger than the sum of its proper divisors (3776717).

8899891 is a wasteful number, since it uses less digits than its factorization.

8899891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

The product of its digits is 373248, while the sum is 52.

The square root of 8899891 is about 2983.2685095378. The cubic root of 8899891 is about 207.2342637865.

Subtracting from 8899891 its reverse (1989988), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 8899891 in words is "eight million, eight hundred ninety-nine thousand, eight hundred ninety-one".