520513381 has 2 divisors, whose sum is σ = 520513382. Its totient is φ = 520513380.

The previous prime is 520513333. The next prime is 520513423. The reversal of 520513381 is 183315025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352162756 + 168350625 = 18766^2 + 12975^2 .

It is a cyclic number.

It is not a de Polignac number, because 520513381 - 2¹⁵ = 520480613 is a prime.

It is a super-2 number, since 2×520513381² = 541868359600102322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520513181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260256690 + 260256691.

It is an arithmetic number, because the mean of its divisors is an integer number (260256691).

Almost surely, 2^520513381 is an apocalyptic number.

It is an amenable number.

520513381 is a deficient number, since it is larger than the sum of its proper divisors (1).

520513381 is an equidigital number, since it uses as much as digits as its factorization.

520513381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 520513381 is about 22814.7623480938. The cubic root of 520513381 is about 804.4097011135.

The spelling of 520513381 in words is "five hundred twenty million, five hundred thirteen thousand, three hundred eighty-one".