285887231 has 4 divisors (see below), whose sum is σ = 326728272. Its totient is φ = 245046192.

The previous prime is 285887209. The next prime is 285887237. The reversal of 285887231 is 132788582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285887231 is a prime.

It is a super-2 number, since 2×285887231² = 163463017697694722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285887237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20420510 + ... + 20420523.

It is an arithmetic number, because the mean of its divisors is an integer number (81682068).

Almost surely, 2^285887231 is an apocalyptic number.

285887231 is a deficient number, since it is larger than the sum of its proper divisors (40841041).

285887231 is an equidigital number, since it uses as much as digits as its factorization.

285887231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40841040.

The product of its digits is 215040, while the sum is 44.

The square root of 285887231 is about 16908.2001111887. The cubic root of 285887231 is about 658.7666214074.

The spelling of 285887231 in words is "two hundred eighty-five million, eight hundred eighty-seven thousand, two hundred thirty-one".