278281 has 4 divisors (see below), whose sum is σ = 279364. Its totient is φ = 277200.

The previous prime is 278279. The next prime is 278321. The reversal of 278281 is 182872.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 84681 + 193600 = 291^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 278281 - 2¹ = 278279 is a prime.

It is a super-2 number, since 2×278281² = 154880629922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278261) 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, 91 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (69841).

2²⁷⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

278281 is a deficient number, since it is larger than the sum of its proper divisors (1083).

278281 is an equidigital number, since it uses as much as digits as its factorization.

278281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082.

The product of its digits is 1792, while the sum is 28.

The square root of 278281 is about 527.5234591940. The cubic root of 278281 is about 65.2871712183.

The spelling of 278281 in words is "two hundred seventy-eight thousand, two hundred eighty-one".