520712321 has 2 divisors, whose sum is σ = 520712322. Its totient is φ = 520712320.

The previous prime is 520712299. The next prime is 520712383. The reversal of 520712321 is 123217025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426835600 + 93876721 = 20660^2 + 9689^2 .

It is a cyclic number.

It is not a de Polignac number, because 520712321 - 2²⁶ = 453603457 is a prime.

It is a super-2 number, since 2×520712321² = 542282642482414082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520712221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260356160 + 260356161.

It is an arithmetic number, because the mean of its divisors is an integer number (260356161).

Almost surely, 2^520712321 is an apocalyptic number.

It is an amenable number.

520712321 is a deficient number, since it is larger than the sum of its proper divisors (1).

520712321 is an equidigital number, since it uses as much as digits as its factorization.

520712321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 520712321 is about 22819.1218279758. The cubic root of 520712321 is about 804.5121697457.

Adding to 520712321 its reverse (123217025), we get a palindrome (643929346).

The spelling of 520712321 in words is "five hundred twenty million, seven hundred twelve thousand, three hundred twenty-one".