521065 has 12 divisors (see below), whose sum is σ = 656964. Its totient is φ = 396704.

The previous prime is 521063. The next prime is 521107. The reversal of 521065 is 560125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 135424 = 621^2 + 368^2 .

It is not a de Polignac number, because 521065 - 2¹ = 521063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521063) 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 in 11 ways as a sum of consecutive naturals, for example, 2547 + ... + 2743.

It is an arithmetic number, because the mean of its divisors is an integer number (54747).

2⁵²¹⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

521065 is a deficient number, since it is larger than the sum of its proper divisors (135899).

521065 is a wasteful number, since it uses less digits than its factorization.

521065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 521065 is about 721.8483220179. The cubic root of 521065 is about 80.4693761066.

Subtracting 521065 from its reverse (560125), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 521065 in words is "five hundred twenty-one thousand, sixty-five".