123235040131 has 6 divisors (see below), whose sum is σ = 143355046740. Its totient is φ = 105630034356.

The previous prime is 123235040039. The next prime is 123235040141. The reversal of 123235040131 is 131040532321.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-123235040131 is a prime.

It is a super-2 number, since 2×123235040131² (a number of 23 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 = 123235040096 and 123235040105.

It is not an unprimeable number, because it can be changed into a prime (123235040141) 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 5 ways as a sum of consecutive naturals, for example, 1257500361 + ... + 1257500458.

It is an arithmetic number, because the mean of its divisors is an integer number (23892507790).

Almost surely, 2^123235040131 is an apocalyptic number.

123235040131 is a deficient number, since it is larger than the sum of its proper divisors (20120006609).

123235040131 is an equidigital number, since it uses as much as digits as its factorization.

123235040131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515000833 (or 2515000826 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 123235040131 its reverse (131040532321), we get a palindrome (254275572452).

The spelling of 123235040131 in words is "one hundred twenty-three billion, two hundred thirty-five million, forty thousand, one hundred thirty-one".