231231 has 36 divisors (see below), whose sum is σ = 424536. Its totient is φ = 110880.

The previous prime is 231223. The next prime is 231241. The reversal of 231231 is 132132.

It is a happy number.

It is not a de Polignac number, because 231231 - 2³ = 231223 is a prime.

It is a super-2 number, since 2×231231² = 106935550722, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17781 + ... + 17793.

2²³¹²³¹ is an apocalyptic number.

231231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231231 is a deficient number, since it is larger than the sum of its proper divisors (193305).

231231 is a wasteful number, since it uses less digits than its factorization.

231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 34 counting only the distinct ones).

The product of its digits is 36, while the sum is 12.

The square root of 231231 is about 480.8648458767. The cubic root of 231231 is about 61.3783702243.

Multiplying 231231 by its sum of digits (12), we get a palindrome (2774772).

Adding to 231231 its reverse (132132), we get a palindrome (363363).

Subtracting from 231231 its reverse (132132), we obtain a palindrome (99099).

The spelling of 231231 in words is "two hundred thirty-one thousand, two hundred thirty-one".