111312113231 has 64 divisors (see below), whose sum is σ = 132035484672. Its totient is φ = 92822400000.

The previous prime is 111312113219. The next prime is 111312113243. The reversal of 111312113231 is 132311213111.

It is an interprime number because it is at equal distance from previous prime (111312113219) and next prime (111312113243).

It is a de Polignac number, because none of the positive numbers 2^k-111312113231 is a prime.

It is a super-2 number, since 2×111312113231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111312113251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189628520 + ... + 189629106.

It is an arithmetic number, because the mean of its divisors is an integer number (2063054448).

Almost surely, 2^111312113231 is an apocalyptic number.

111312113231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111312113231 is a deficient number, since it is larger than the sum of its proper divisors (20723371441).

111312113231 is a wasteful number, since it uses less digits than its factorization.

111312113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944.

The product of its digits is 108, while the sum is 20.

Adding to 111312113231 its reverse (132311213111), we get a palindrome (243623326342).

The spelling of 111312113231 in words is "one hundred eleven billion, three hundred twelve million, one hundred thirteen thousand, two hundred thirty-one".