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8081 is a prime number
BaseRepresentation
bin1111110010001
3102002022
41332101
5224311
6101225
732363
oct17621
912068
108081
116087
124815
1338a8
142d33
1525db
hex1f91

8081 has 2 divisors, whose sum is σ = 8082. Its totient is φ = 8080.

The previous prime is 8069. The next prime is 8087. The reversal of 8081 is 1808.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400 + 1681 = 80^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 8081 - 26 = 8017 is a prime.

It is a super-2 number, since 2×80812 = 130605122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8087) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4040 + 4041.

It is an arithmetic number, because the mean of its divisors is an integer number (4041).

28081 is an apocalyptic number.

It is an amenable number.

8081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8081 is an equidigital number, since it uses as much as digits as its factorization.

8081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 8081 is about 89.8943824719. The cubic root of 8081 is about 20.0672734604.

Adding to 8081 its reverse (1808), we get a palindrome (9889).

It can be divided in two parts, 80 and 81, that added together give a palindrome (161).

The spelling of 8081 in words is "eight thousand, eighty-one".