320513534513 has 2 divisors, whose sum is σ = 320513534514. Its totient is φ = 320513534512.

The previous prime is 320513534489. The next prime is 320513534533. The reversal of 320513534513 is 315435315023.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163565242624 + 156948291889 = 404432^2 + 396167^2 .

It is a cyclic number.

It is not a de Polignac number, because 320513534513 - 2¹² = 320513530417 is a prime.

It is a super-3 number, since 3×320513534513³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (320513534533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160256767256 + 160256767257.

It is an arithmetic number, because the mean of its divisors is an integer number (160256767257).

Almost surely, 2^320513534513 is an apocalyptic number.

It is an amenable number.

320513534513 is a deficient number, since it is larger than the sum of its proper divisors (1).

320513534513 is an equidigital number, since it uses as much as digits as its factorization.

320513534513 is an evil number, because the sum of its binary digits is even.

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

Adding to 320513534513 its reverse (315435315023), we get a palindrome (635948849536).

The spelling of 320513534513 in words is "three hundred twenty billion, five hundred thirteen million, five hundred thirty-four thousand, five hundred thirteen".