285231 has 8 divisors (see below), whose sum is σ = 392704. Its totient is φ = 183960.

The previous prime is 285227. The next prime is 285251. The reversal of 285231 is 132582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 285231 - 2² = 285227 is a prime.

It is a super-2 number, since 2×285231² = 162713446722, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁴ + 8⁶ + 2¹⁴ + 5³ + 3⁸ + 1 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 285198 and 285207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (49088).

2²⁸⁵²³¹ is an apocalyptic number.

285231 is a deficient number, since it is larger than the sum of its proper divisors (107473).

285231 is a wasteful number, since it uses less digits than its factorization.

285231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101.

The product of its digits is 480, while the sum is 21.

The square root of 285231 is about 534.0702201022. The cubic root of 285231 is about 65.8262186760.

The spelling of 285231 in words is "two hundred eighty-five thousand, two hundred thirty-one".