8009891 has 4 divisors (see below), whose sum is σ = 8017992. Its totient is φ = 8001792.

The previous prime is 8009863. The next prime is 8009893. The reversal of 8009891 is 1989008.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8009891 - 2¹⁰ = 8008867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8009893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321 + ... + 4626.

It is an arithmetic number, because the mean of its divisors is an integer number (2004498).

Almost surely, 2^8009891 is an apocalyptic number.

8009891 is a deficient number, since it is larger than the sum of its proper divisors (8101).

8009891 is a wasteful number, since it uses less digits than its factorization.

8009891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8100.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 8009891 is about 2830.1750829233. The cubic root of 8009891 is about 200.0823910539.

The spelling of 8009891 in words is "eight million, nine thousand, eight hundred ninety-one".