521066 has 24 divisors (see below), whose sum is σ = 981540. Its totient is φ = 205632.

The previous prime is 521063. The next prime is 521107. The reversal of 521066 is 660125.

It can be written as a sum of positive squares in 2 ways, for example, as 519841 + 1225 = 721^2 + 35^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521066.

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, 1070 + ... + 1478.

2⁵²¹⁰⁶⁶ is an apocalyptic number.

521066 is a deficient number, since it is larger than the sum of its proper divisors (460474).

521066 is a wasteful number, since it uses less digits than its factorization.

521066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 521066 is about 721.8490146838. The cubic root of 521066 is about 80.4694275841.

The spelling of 521066 in words is "five hundred twenty-one thousand, sixty-six".