Search a number

8791 has 4 divisors (see below), whose sum is σ = 9000. Its totient is φ = 8584.

The previous prime is 8783. The next prime is 8803. The reversal of 8791 is 1978.

It can be divided in two parts, 8 and 791, that multiplied together give a triangular number (6328 = T112).

8791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8791 - 23 = 8783 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16 + ... + 133.

It is an arithmetic number, because the mean of its divisors is an integer number (2250).

8791 is a deficient number, since it is larger than the sum of its proper divisors (209).

8791 is a wasteful number, since it uses less digits than its factorization.

8791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 504, while the sum is 25.

The square root of 8791 is about 93.7603327639. The cubic root of 8791 is about 20.6385616348.

The spelling of 8791 in words is "eight thousand, seven hundred ninety-one".

Divisors: 1 59 149 8791