233231312131 has 4 divisors (see below), whose sum is σ = 241273771200. Its totient is φ = 225188853064.

The previous prime is 233231312117. The next prime is 233231312143. The reversal of 233231312131 is 131213132332.

233231312131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-233231312131 is a prime.

It is a super-2 number, since 2×233231312131² (a number of 24 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 = 233231312096 and 233231312105.

It is not an unprimeable number, because it can be changed into a prime (233231312191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4021229491 + ... + 4021229548.

It is an arithmetic number, because the mean of its divisors is an integer number (60318442800).

Almost surely, 2^233231312131 is an apocalyptic number.

233231312131 is a deficient number, since it is larger than the sum of its proper divisors (8042459069).

233231312131 is an equidigital number, since it uses as much as digits as its factorization.

233231312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8042459068.

The product of its digits is 1944, while the sum is 25.

Adding to 233231312131 its reverse (131213132332), we get a palindrome (364444444463).

The spelling of 233231312131 in words is "two hundred thirty-three billion, two hundred thirty-one million, three hundred twelve thousand, one hundred thirty-one".