111312231231 has 4 divisors (see below), whose sum is σ = 148416308312. Its totient is φ = 74208154152.

The previous prime is 111312231227. The next prime is 111312231257. The reversal of 111312231231 is 132132213111.

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

It is not a de Polignac number, because 111312231231 - 2² = 111312231227 is a prime.

It is a super-2 number, since 2×111312231231² (a number of 23 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 = 111312231198 and 111312231207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111312231131) 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, 18552038536 + ... + 18552038541.

It is an arithmetic number, because the mean of its divisors is an integer number (37104077078).

Almost surely, 2^111312231231 is an apocalyptic number.

111312231231 is a deficient number, since it is larger than the sum of its proper divisors (37104077081).

111312231231 is an equidigital number, since it uses as much as digits as its factorization.

111312231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37104077080.

The product of its digits is 216, while the sum is 21.

Adding to 111312231231 its reverse (132132213111), we get a palindrome (243444444342).

The spelling of 111312231231 in words is "one hundred eleven billion, three hundred twelve million, two hundred thirty-one thousand, two hundred thirty-one".