8216791 has 4 divisors (see below), whose sum is σ = 8963784. Its totient is φ = 7469800.

The previous prime is 8216783. The next prime is 8216801. The reversal of 8216791 is 1976128.

It is a happy number.

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 8216791 - 2³ = 8216783 is a prime.

It is a Duffinian number.

8216791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216731) 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, 373480 + ... + 373501.

It is an arithmetic number, because the mean of its divisors is an integer number (2240946).

Almost surely, 2^8216791 is an apocalyptic number.

8216791 is a deficient number, since it is larger than the sum of its proper divisors (746993).

8216791 is a wasteful number, since it uses less digits than its factorization.

8216791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746992.

The product of its digits is 6048, while the sum is 34.

The square root of 8216791 is about 2866.4945490965. The cubic root of 8216791 is about 201.7905141268.

The spelling of 8216791 in words is "eight million, two hundred sixteen thousand, seven hundred ninety-one".