531321024013 has 4 divisors (see below), whose sum is σ = 572191872028. Its totient is φ = 490450176000.

The previous prime is 531321023971. The next prime is 531321024071. The reversal of 531321024013 is 310420123135.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99359235369 + 431961788644 = 315213^2 + 657238^2 .

It is a cyclic number.

It is not a de Polignac number, because 531321024013 - 2¹³ = 531321015821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531321024613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20435423988 + ... + 20435424013.

It is an arithmetic number, because the mean of its divisors is an integer number (143047968007).

Almost surely, 2^531321024013 is an apocalyptic number.

It is an amenable number.

531321024013 is a deficient number, since it is larger than the sum of its proper divisors (40870848015).

531321024013 is a wasteful number, since it uses less digits than its factorization.

531321024013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40870848014.

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

Adding to 531321024013 its reverse (310420123135), we get a palindrome (841741147148).

The spelling of 531321024013 in words is "five hundred thirty-one billion, three hundred twenty-one million, twenty-four thousand, thirteen".