831231 has 12 divisors (see below), whose sum is σ = 1264120. Its totient is φ = 524880.

The previous prime is 831221. The next prime is 831239. The reversal of 831231 is 132138.

It is not a de Polignac number, because 831231 - 2⁶ = 831167 is a prime.

It is a super-2 number, since 2×831231² = 1381889950722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2260 + ... + 2601.

2⁸³¹²³¹ is an apocalyptic number.

831231 is a deficient number, since it is larger than the sum of its proper divisors (432889).

831231 is a wasteful number, since it uses less digits than its factorization.

831231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886 (or 4883 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 831231 is about 911.7187066195. The cubic root of 831231 is about 94.0244013911.

Adding to 831231 its reverse (132138), we get a palindrome (963369).

The spelling of 831231 in words is "eight hundred thirty-one thousand, two hundred thirty-one".