520381 has 2 divisors, whose sum is σ = 520382. Its totient is φ = 520380.

The previous prime is 520379. The next prime is 520393. The reversal of 520381 is 183025.

It is a happy number.

It is the 295-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 285156 + 235225 = 534^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 520381 - 2¹ = 520379 is a prime.

It is a super-2 number, since 2×520381² = 541592770322, which contains 22 as substring.

Together with 520379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260190 + 260191.

It is an arithmetic number, because the mean of its divisors is an integer number (260191).

2⁵²⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

520381 is a deficient number, since it is larger than the sum of its proper divisors (1).

520381 is an equidigital number, since it uses as much as digits as its factorization.

520381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 520381 is about 721.3743826890. The cubic root of 520381 is about 80.4341500760.

The spelling of 520381 in words is "five hundred twenty thousand, three hundred eighty-one".