231231231 has 24 divisors (see below), whose sum is σ = 416417664. Its totient is φ = 120119760.

The previous prime is 231231199. The next prime is 231231251. The reversal of 231231231 is 132132132.

It is not a de Polignac number, because 231231231 - 2⁵ = 231231199 is a prime.

It is a super-2 number, since 2×231231231² = 106935764379550722, which contains 22 as substring.

231231231 is a modest number, since divided by 231231 gives 231 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166141 + ... + 167526.

It is an arithmetic number, because the mean of its divisors is an integer number (17350736).

Almost surely, 2^231231231 is an apocalyptic number.

231231231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231231231 is a deficient number, since it is larger than the sum of its proper divisors (185186433).

231231231 is a wasteful number, since it uses less digits than its factorization.

231231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333691 (or 333688 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231231231 is about 15206.2891923046. The cubic root of 231231231 is about 613.7839066333.

Adding to 231231231 its reverse (132132132), we get a palindrome (363363363).

Subtracting from 231231231 its reverse (132132132), we obtain a palindrome (99099099).

The spelling of 231231231 in words is "two hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".