Search a number
12081 = 34027
BaseRepresentation
bin10111100110001
3121120110
42330301
5341311
6131533
750136
oct27461
917513
1012081
119093
126ba9
135664
14458d
1538a6
hex2f31

12081 has 4 divisors (see below), whose sum is σ = 16112. Its totient is φ = 8052.

The previous prime is 12073. The next prime is 12097. The reversal of 12081 is 18021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18021 = 36007.

It is not a de Polignac number, because 12081 - 23 = 12073 is a prime.

It is a super-2 number, since 2×120812 = 291901122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

12081 is a modest number, since divided by 81 gives 12 as remainder.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (12011) 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, 2011 + ... + 2016.

It is an arithmetic number, because the mean of its divisors is an integer number (4028).

212081 is an apocalyptic number.

It is an amenable number.

12081 is a deficient number, since it is larger than the sum of its proper divisors (4031).

12081 is an equidigital number, since it uses as much as digits as its factorization.

12081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 12081 is about 109.9136024339. The cubic root of 12081 is about 22.9456815224.

The spelling of 12081 in words is "twelve thousand, eighty-one".

Divisors: 1 3 4027 12081