231331112111312 has 20 divisors (see below), whose sum is σ = 474568972640676. Its totient is φ = 108861699816960.

The previous prime is 231331112111257. The next prime is 231331112111317. The reversal of 231331112111312 is 213111211133132.

It can be written as a sum of positive squares in 2 ways, for example, as 203903434834576 + 27427677276736 = 14279476^2 + 5237144^2 .

It is a super-2 number, since 2×231331112111312² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331112111317) 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, 425241014639 + ... + 425241015182.

Almost surely, 2^{231331112111312} is an apocalyptic number.

It is an amenable number.

231331112111312 is an abundant number, since it is smaller than the sum of its proper divisors (243237860529364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231331112111312 is a wasteful number, since it uses less digits than its factorization.

231331112111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850482029846 (or 850482029840 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

Adding to 231331112111312 its reverse (213111211133132), we get a palindrome (444442323244444).

The spelling of 231331112111312 in words is "two hundred thirty-one trillion, three hundred thirty-one billion, one hundred twelve million, one hundred eleven thousand, three hundred twelve".