111312312131 has 4 divisors (see below), whose sum is σ = 112973689992. Its totient is φ = 109650934272.

The previous prime is 111312312127. The next prime is 111312312161. The reversal of 111312312131 is 131213213111.

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

It is a cyclic number.

It is not a de Polignac number, because 111312312131 - 2² = 111312312127 is a prime.

It is a super-2 number, since 2×111312312131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111312312161) 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, 830688830 + ... + 830688963.

It is an arithmetic number, because the mean of its divisors is an integer number (28243422498).

Almost surely, 2^111312312131 is an apocalyptic number.

111312312131 is a deficient number, since it is larger than the sum of its proper divisors (1661377861).

111312312131 is an equidigital number, since it uses as much as digits as its factorization.

111312312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661377860.

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

Adding to 111312312131 its reverse (131213213111), we get a palindrome (242525525242).

The spelling of 111312312131 in words is "one hundred eleven billion, three hundred twelve million, three hundred twelve thousand, one hundred thirty-one".