8216891 has 8 divisors (see below), whose sum is σ = 8515968. Its totient is φ = 7920000.

The previous prime is 8216863. The next prime is 8216893. The reversal of 8216891 is 1986128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8216891 - 2²² = 4022587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8216893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12101 + ... + 12761.

It is an arithmetic number, because the mean of its divisors is an integer number (1064496).

Almost surely, 2^8216891 is an apocalyptic number.

8216891 is a deficient number, since it is larger than the sum of its proper divisors (299077).

8216891 is a wasteful number, since it uses less digits than its factorization.

8216891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 6912, while the sum is 35.

The square root of 8216891 is about 2866.5119919512. The cubic root of 8216891 is about 201.7913327339.

The spelling of 8216891 in words is "eight million, two hundred sixteen thousand, eight hundred ninety-one".