285131 has 18 divisors (see below), whose sum is σ = 378252. Its totient is φ = 212520.

The previous prime is 285121. The next prime is 285139. The reversal of 285131 is 131582.

It is not a de Polignac number, because 285131 - 2¹⁴ = 268747 is a prime.

It is a super-2 number, since 2×285131² = 162599374322, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285131.

It is not an unprimeable number, because it can be changed into a prime (285139) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12386 + ... + 12408.

It is an arithmetic number, because the mean of its divisors is an integer number (21014).

2²⁸⁵¹³¹ is an apocalyptic number.

285131 is a deficient number, since it is larger than the sum of its proper divisors (93121).

285131 is a wasteful number, since it uses less digits than its factorization.

285131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 41 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 285131 is about 533.9765912472. The cubic root of 285131 is about 65.8185250391.

It can be divided in two parts, 2851 and 31, that added together give a palindrome (2882).

The spelling of 285131 in words is "two hundred eighty-five thousand, one hundred thirty-one".