231211133231 has 8 divisors (see below), whose sum is σ = 249099402720. Its totient is φ = 213337549152.

The previous prime is 231211133227. The next prime is 231211133261. The reversal of 231211133231 is 132331112132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231211133231 - 2² = 231211133227 is a prime.

It is a super-2 number, since 2×231211133231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231211133197 and 231211133206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211133221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3638636 + ... + 3701633.

It is an arithmetic number, because the mean of its divisors is an integer number (31137425340).

Almost surely, 2^231211133231 is an apocalyptic number.

231211133231 is a deficient number, since it is larger than the sum of its proper divisors (17888269489).

231211133231 is a wasteful number, since it uses less digits than its factorization.

231211133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7342705.

The product of its digits is 648, while the sum is 23.

Adding to 231211133231 its reverse (132331112132), we get a palindrome (363542245363).

The spelling of 231211133231 in words is "two hundred thirty-one billion, two hundred eleven million, one hundred thirty-three thousand, two hundred thirty-one".