285686231 has 4 divisors (see below), whose sum is σ = 285720552. Its totient is φ = 285651912.

The previous prime is 285686227. The next prime is 285686239. The reversal of 285686231 is 132686582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 285686231 - 2² = 285686227 is a prime.

It is a super-2 number, since 2×285686231² = 163233245165970722, 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 (285686239) 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, 4136 + ... + 24258.

It is an arithmetic number, because the mean of its divisors is an integer number (71430138).

Almost surely, 2^285686231 is an apocalyptic number.

285686231 is a deficient number, since it is larger than the sum of its proper divisors (34321).

285686231 is a wasteful number, since it uses less digits than its factorization.

285686231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34320.

The product of its digits is 138240, while the sum is 41.

The square root of 285686231 is about 16902.2552045578. The cubic root of 285686231 is about 658.6121978906.

The spelling of 285686231 in words is "two hundred eighty-five million, six hundred eighty-six thousand, two hundred thirty-one".