231111312 has 40 divisors (see below), whose sum is σ = 597967680. Its totient is φ = 76917120.

The previous prime is 231111281. The next prime is 231111347. The reversal of 231111312 is 213111132.

It is a happy number.

231111312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231111312² = 106824877068722688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 231111291 and 231111300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30637 + ... + 37427.

It is an arithmetic number, because the mean of its divisors is an integer number (14949192).

Almost surely, 2^231111312 is an apocalyptic number.

It is an amenable number.

231111312 is an abundant number, since it is smaller than the sum of its proper divisors (366856368).

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

231111312 is a wasteful number, since it uses less digits than its factorization.

231111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511 (or 7505 counting only the distinct ones).

The product of its digits is 36, while the sum is 15.

The square root of 231111312 is about 15202.3456084908. The cubic root of 231111312 is about 613.6777833102.

Adding to 231111312 its reverse (213111132), we get a palindrome (444222444).

The spelling of 231111312 in words is "two hundred thirty-one million, one hundred eleven thousand, three hundred twelve".