Search a number
8091 = 322931
BaseRepresentation
bin1111110011011
3102002200
41332123
5224331
6101243
732406
oct17633
912080
108091
116096
124823
1338b5
142d3d
1525e6
hex1f9b

8091 has 12 divisors (see below), whose sum is σ = 12480. Its totient is φ = 5040.

The previous prime is 8089. The next prime is 8093. The reversal of 8091 is 1908.

Adding to 8091 its reverse (1908), we get a palindrome (9999).

It can be divided in two parts, 80 and 91, that added together give a palindrome (171).

It is an interprime number because it is at equal distance from previous prime (8089) and next prime (8093).

It is not a de Polignac number, because 8091 - 21 = 8089 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246 + ... + 276.

It is an arithmetic number, because the mean of its divisors is an integer number (1040).

28091 is an apocalyptic number.

8091 is a deficient number, since it is larger than the sum of its proper divisors (4389).

8091 is a wasteful number, since it uses less digits than its factorization.

8091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 8091 is about 89.9499861034. The cubic root of 8091 is about 20.0755476020.

The spelling of 8091 in words is "eight thousand, ninety-one".

Divisors: 1 3 9 29 31 87 93 261 279 899 2697 8091