111231323131 has 2 divisors, whose sum is σ = 111231323132. Its totient is φ = 111231323130.

The previous prime is 111231323123. The next prime is 111231323219. The reversal of 111231323131 is 131323132111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111231323131 - 2³ = 111231323123 is a prime.

It is a super-2 number, since 2×111231323131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111231323531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55615661565 + 55615661566.

It is an arithmetic number, because the mean of its divisors is an integer number (55615661566).

Almost surely, 2^111231323131 is an apocalyptic number.

111231323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

111231323131 is an equidigital number, since it uses as much as digits as its factorization.

111231323131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

Adding to 111231323131 its reverse (131323132111), we get a palindrome (242554455242).

The spelling of 111231323131 in words is "one hundred eleven billion, two hundred thirty-one million, three hundred twenty-three thousand, one hundred thirty-one".