285139 has 2 divisors, whose sum is σ = 285140. Its totient is φ = 285138.

The previous prime is 285121. The next prime is 285151. The reversal of 285139 is 931582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285139 - 2¹⁷ = 154067 is a prime.

It is not a weakly prime, because it can be changed into another prime (285119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142569 + 142570.

It is an arithmetic number, because the mean of its divisors is an integer number (142570).

2²⁸⁵¹³⁹ is an apocalyptic number.

285139 is a deficient number, since it is larger than the sum of its proper divisors (1).

285139 is an equidigital number, since it uses as much as digits as its factorization.

285139 is an evil number, because the sum of its binary digits is even.

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

The square root of 285139 is about 533.9840821598. The cubic root of 285139 is about 65.8191405962.

It can be divided in two parts, 285 and 139, that added together give a palindrome (424).

The spelling of 285139 in words is "two hundred eighty-five thousand, one hundred thirty-nine".