281539 has 2 divisors, whose sum is σ = 281540. Its totient is φ = 281538.

The previous prime is 281531. The next prime is 281549. The reversal of 281539 is 935182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281539 - 2³ = 281531 is a prime.

281539 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (281531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140769 + 140770.

It is an arithmetic number, because the mean of its divisors is an integer number (140770).

2²⁸¹⁵³⁹ is an apocalyptic number.

281539 is a deficient number, since it is larger than the sum of its proper divisors (1).

281539 is an equidigital number, since it uses as much as digits as its factorization.

281539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 281539 is about 530.6024877439. The cubic root of 281539 is about 65.5409684845.

It can be divided in two parts, 281 and 539, that added together give a triangular number (820 = T₄₀).

The spelling of 281539 in words is "two hundred eighty-one thousand, five hundred thirty-nine".