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BaseRepresentation
bin10111111111001
3121211212
42333321
5343111
6132505
750543
oct27771
917755
1012281
119255
127135
135789
144693
15398b
hex2ff9

12281 has 2 divisors, whose sum is σ = 12282. Its totient is φ = 12280.

The previous prime is 12277. The next prime is 12289. The reversal of 12281 is 18221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11881 + 400 = 109^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 12281 - 22 = 12277 is a prime.

It is a super-2 number, since 2×122812 = 301645922, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (12289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6140 + 6141.

It is an arithmetic number, because the mean of its divisors is an integer number (6141).

212281 is an apocalyptic number.

It is an amenable number.

12281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12281 is an equidigital number, since it uses as much as digits as its factorization.

12281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 14.

The square root of 12281 is about 110.8196733437. The cubic root of 12281 is about 23.0716104580.

The spelling of 12281 in words is "twelve thousand, two hundred eighty-one".