2281 has 2 divisors, whose sum is σ = 2282. Its totient is φ = 2280.

The previous prime is 2273. The next prime is 2287. The reversal of 2281 is 1822.

2281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 20-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2025 + 256 = 45^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 2281 - 2³ = 2273 is a prime.

It is a super-2 number, since 2×2281² = 10405922, which contains 22 as substring.

It is a Chen prime.

It is a magnanimous number.

2281 is a lucky number.

It is a nialpdrome in base 5 and base 15.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (2287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1140 + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (1141).

2²²⁸¹ is an apocalyptic number.

It is an amenable number.

2281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2281 is an equidigital number, since it uses as much as digits as its factorization.

2281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 13.

The square root of 2281 is about 47.7598157450. The cubic root of 2281 is about 13.1636126727.

The spelling of 2281 in words is "two thousand, two hundred eighty-one".