123531523444 has 48 divisors (see below), whose sum is σ = 249007933440. Its totient is φ = 52525836000.

The previous prime is 123531523421. The next prime is 123531523463. The reversal of 123531523444 is 444325135321.

It is a super-2 number, since 2×123531523444² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6244569 + ... + 6264319.

It is an arithmetic number, because the mean of its divisors is an integer number (5187665280).

Almost surely, 2^123531523444 is an apocalyptic number.

123531523444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

123531523444 is an abundant number, since it is smaller than the sum of its proper divisors (125476409996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123531523444 is a wasteful number, since it uses less digits than its factorization.

123531523444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21508 (or 21506 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

Adding to 123531523444 its reverse (444325135321), we get a palindrome (567856658765).

The spelling of 123531523444 in words is "one hundred twenty-three billion, five hundred thirty-one million, five hundred twenty-three thousand, four hundred forty-four".