231313321231 has 4 divisors (see below), whose sum is σ = 231346993264. Its totient is φ = 231279649200.

The previous prime is 231313321193. The next prime is 231313321241. The reversal of 231313321231 is 132123313132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231313321231 - 2¹⁹ = 231312796943 is a prime.

It is a super-2 number, since 2×231313321231² (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 = 231313321196 and 231313321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231313321241) 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, 16825710 + ... + 16839451.

It is an arithmetic number, because the mean of its divisors is an integer number (57836748316).

Almost surely, 2^231313321231 is an apocalyptic number.

231313321231 is a deficient number, since it is larger than the sum of its proper divisors (33672033).

231313321231 is an equidigital number, since it uses as much as digits as its factorization.

231313321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33672032.

The product of its digits is 1944, while the sum is 25.

Adding to 231313321231 its reverse (132123313132), we get a palindrome (363436634363).

The spelling of 231313321231 in words is "two hundred thirty-one billion, three hundred thirteen million, three hundred twenty-one thousand, two hundred thirty-one".