531323113512 has 128 divisors (see below), whose sum is σ = 1364587223040. Its totient is φ = 172317442560.

The previous prime is 531323113507. The next prime is 531323113523. The reversal of 531323113512 is 215311323135.

It is a self number, because there is not a number n which added to its sum of digits gives 531323113512.

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 31 ways as a sum of consecutive naturals, for example, 248629308 + ... + 248631444.

It is an arithmetic number, because the mean of its divisors is an integer number (10660837680).

Almost surely, 2^531323113512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531323113512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682293611520).

531323113512 is an abundant number, since it is smaller than the sum of its proper divisors (833264109528).

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

531323113512 is a wasteful number, since it uses less digits than its factorization.

531323113512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391 (or 3387 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

Adding to 531323113512 its reverse (215311323135), we get a palindrome (746634436647).

The spelling of 531323113512 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred thirteen thousand, five hundred twelve".