8286811891 has 4 divisors (see below), whose sum is σ = 8774271432. Its totient is φ = 7799352352.

The previous prime is 8286811889. The next prime is 8286811913. The reversal of 8286811891 is 1981186828.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8286811891 - 2¹ = 8286811889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8286811811) 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, 243729745 + ... + 243729778.

It is an arithmetic number, because the mean of its divisors is an integer number (2193567858).

Almost surely, 2^8286811891 is an apocalyptic number.

8286811891 is a deficient number, since it is larger than the sum of its proper divisors (487459541).

8286811891 is a wasteful number, since it uses less digits than its factorization.

8286811891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487459540.

The product of its digits is 442368, while the sum is 52.

The square root of 8286811891 is about 91031.9278659966. The cubic root of 8286811891 is about 2023.6209187455.

The spelling of 8286811891 in words is "eight billion, two hundred eighty-six million, eight hundred eleven thousand, eight hundred ninety-one".