320513534531 has 4 divisors (see below), whose sum is σ = 320690517864. Its totient is φ = 320336551200.

The previous prime is 320513534513. The next prime is 320513534533. The reversal of 320513534531 is 135435315023.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 320513534531 - 2¹⁰ = 320513533507 is a prime.

It is a super-3 number, since 3×320513534531³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320513534491 and 320513534500.

It is not an unprimeable number, because it can be changed into a prime (320513534533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88488950 + ... + 88492571.

It is an arithmetic number, because the mean of its divisors is an integer number (80172629466).

Almost surely, 2^320513534531 is an apocalyptic number.

320513534531 is a deficient number, since it is larger than the sum of its proper divisors (176983333).

320513534531 is a wasteful number, since it uses less digits than its factorization.

320513534531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176983332.

The product of its (nonzero) digits is 81000, while the sum is 35.

Adding to 320513534531 its reverse (135435315023), we get a palindrome (455948849554).

The spelling of 320513534531 in words is "three hundred twenty billion, five hundred thirteen million, five hundred thirty-four thousand, five hundred thirty-one".