520641 has 16 divisors (see below), whose sum is σ = 841920. Its totient is φ = 315360.

The previous prime is 520633. The next prime is 520649. The reversal of 520641 is 146025.

It is a happy number.

520641 is a `hidden beast` number, since 5 + 20 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (520633) and next prime (520649).

It is not a de Polignac number, because 520641 - 2³ = 520633 is a prime.

It is a Curzon number.

520641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (520649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (52620).

2⁵²⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

520641 is a deficient number, since it is larger than the sum of its proper divisors (321279).

520641 is a wasteful number, since it uses less digits than its factorization.

520641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 520641 is about 721.5545717408. The cubic root of 520641 is about 80.4475437222.

Adding to 520641 its reverse (146025), we get a palindrome (666666).

The spelling of 520641 in words is "five hundred twenty thousand, six hundred forty-one".