281243 has 2 divisors, whose sum is σ = 281244. Its totient is φ = 281242.

The previous prime is 281233. The next prime is 281249. The reversal of 281243 is 342182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 281243 - 2⁴ = 281227 is a prime.

It is a Chen prime.

It is equal to p₂₄₅₃₆ and since 281243 and 24536 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281243.

It is not a weakly prime, because it can be changed into another prime (281249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140621 + 140622.

It is an arithmetic number, because the mean of its divisors is an integer number (140622).

2²⁸¹²⁴³ is an apocalyptic number.

281243 is a deficient number, since it is larger than the sum of its proper divisors (1).

281243 is an equidigital number, since it uses as much as digits as its factorization.

281243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 281243 is about 530.3234861856. The cubic root of 281243 is about 65.5179912895.

The spelling of 281243 in words is "two hundred eighty-one thousand, two hundred forty-three".