123531523443 has 32 divisors (see below), whose sum is σ = 189738444800. Its totient is φ = 79349608800.

The previous prime is 123531523421. The next prime is 123531523463. The reversal of 123531523443 is 344325135321.

123531523443 is a `hidden beast` number, since 1 + 2 + 3 + 531 + 52 + 34 + 43 = 666.

It is not a de Polignac number, because 123531523443 - 2⁸ = 123531523187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123531523398 and 123531523407.

It is not an unprimeable number, because it can be changed into a prime (123531523463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130573 + ... + 513918.

It is an arithmetic number, because the mean of its divisors is an integer number (5929326400).

Almost surely, 2^123531523443 is an apocalyptic number.

123531523443 is a deficient number, since it is larger than the sum of its proper divisors (66206921357).

123531523443 is a wasteful number, since it uses less digits than its factorization.

123531523443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644760 (or 644754 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

Adding to 123531523443 its reverse (344325135321), we get a palindrome (467856658764).

The spelling of 123531523443 in words is "one hundred twenty-three billion, five hundred thirty-one million, five hundred twenty-three thousand, four hundred forty-three".