285155 has 16 divisors (see below), whose sum is σ = 381024. Its totient is φ = 203520.

The previous prime is 285151. The next prime is 285161. The reversal of 285155 is 551582.

It is a Cunningham number, because it is equal to 534²-1.

It is not a de Polignac number, because 285155 - 2² = 285151 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285155.

It is not an unprimeable number, because it can be changed into a prime (285151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2612 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (23814).

2²⁸⁵¹⁵⁵ is an apocalyptic number.

285155 is a deficient number, since it is larger than the sum of its proper divisors (95869).

285155 is a wasteful number, since it uses less digits than its factorization.

285155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166.

The product of its digits is 2000, while the sum is 26.

The square root of 285155 is about 533.9990636696. Note that the first 3 decimals coincide. The cubic root of 285155 is about 65.8203716760.

The spelling of 285155 in words is "two hundred eighty-five thousand, one hundred fifty-five".