285161 has 2 divisors, whose sum is σ = 285162. Its totient is φ = 285160.

The previous prime is 285151. The next prime is 285179. The reversal of 285161 is 161582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225625 + 59536 = 475^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 285161 - 2¹⁴ = 268777 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142580 + 142581.

It is an arithmetic number, because the mean of its divisors is an integer number (142581).

2²⁸⁵¹⁶¹ is an apocalyptic number.

It is an amenable number.

285161 is a deficient number, since it is larger than the sum of its proper divisors (1).

285161 is an equidigital number, since it uses as much as digits as its factorization.

285161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 285161 is about 534.0046816274. The cubic root of 285161 is about 65.8208333190.

The spelling of 285161 in words is "two hundred eighty-five thousand, one hundred sixty-one".