111312131023 has 4 divisors (see below), whose sum is σ = 111366993640. Its totient is φ = 111257268408.

The previous prime is 111312131017. The next prime is 111312131027. The reversal of 111312131023 is 320131213111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320131213111 = 22973 ⋅13935107.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111312131023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111312131027) 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, 27428265 + ... + 27432322.

It is an arithmetic number, because the mean of its divisors is an integer number (27841748410).

Almost surely, 2^111312131023 is an apocalyptic number.

111312131023 is a deficient number, since it is larger than the sum of its proper divisors (54862617).

111312131023 is an equidigital number, since it uses as much as digits as its factorization.

111312131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54862616.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 111312131023 its reverse (320131213111), we get a palindrome (431443344134).

The spelling of 111312131023 in words is "one hundred eleven billion, three hundred twelve million, one hundred thirty-one thousand, twenty-three".