123531543011205 has 48 divisors (see below), whose sum is σ = 244711002691584. Its totient is φ = 56471355187200.

The previous prime is 123531543011141. The next prime is 123531543011257. The reversal of 123531543011205 is 502110345135321.

It is a happy number.

123531543011205 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 3 + 1 + 5 + 430 + 11 + 205 = 666.

It is not a de Polignac number, because 123531543011205 - 2⁶ = 123531543011141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123531543011205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114374812 + ... + 115449818.

It is an arithmetic number, because the mean of its divisors is an integer number (5098145889408).

Almost surely, 2^{123531543011205} is an apocalyptic number.

123531543011205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123531543011205 is a deficient number, since it is larger than the sum of its proper divisors (121179459680379).

123531543011205 is a wasteful number, since it uses less digits than its factorization.

123531543011205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439826 (or 1439823 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 123531543011205 its reverse (502110345135321), we get a palindrome (625641888146526).

The spelling of 123531543011205 in words is "one hundred twenty-three trillion, five hundred thirty-one billion, five hundred forty-three million, eleven thousand, two hundred five".