520345313 has 2 divisors, whose sum is σ = 520345314. Its totient is φ = 520345312.

The previous prime is 520345291. The next prime is 520345337. The reversal of 520345313 is 313543025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519520849 + 824464 = 22793^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 520345313 - 2¹⁰ = 520344289 is a prime.

It is a super-2 number, since 2×520345313² = 541518489522135938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520345363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260172656 + 260172657.

It is an arithmetic number, because the mean of its divisors is an integer number (260172657).

Almost surely, 2^520345313 is an apocalyptic number.

It is an amenable number.

520345313 is a deficient number, since it is larger than the sum of its proper divisors (1).

520345313 is an equidigital number, since it uses as much as digits as its factorization.

520345313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 520345313 is about 22811.0787338083. The cubic root of 520345313 is about 804.3231134687.

Adding to 520345313 its reverse (313543025), we get a palindrome (833888338).

The spelling of 520345313 in words is "five hundred twenty million, three hundred forty-five thousand, three hundred thirteen".