231312331231 has 8 divisors (see below), whose sum is σ = 234119516400. Its totient is φ = 228505629312.

The previous prime is 231312331157. The next prime is 231312331321. The reversal of 231312331231 is 132133213132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231312331231 is a prime.

It is a super-2 number, since 2×231312331231² (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 = 231312331196 and 231312331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312331331) 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, 893671 + ... + 1123063.

It is an arithmetic number, because the mean of its divisors is an integer number (29264939550).

Almost surely, 2^231312331231 is an apocalyptic number.

231312331231 is a deficient number, since it is larger than the sum of its proper divisors (2807185169).

231312331231 is a wasteful number, since it uses less digits than its factorization.

231312331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241625.

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

Adding to 231312331231 its reverse (132133213132), we get a palindrome (363445544363).

The spelling of 231312331231 in words is "two hundred thirty-one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred thirty-one".