521606 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 245640.

The previous prime is 521603. The next prime is 521641. The reversal of 521606 is 606125.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2825 + ... + 3003.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁵²¹⁶⁰⁶ is an apocalyptic number.

521606 is a deficient number, since it is larger than the sum of its proper divisors (307834).

521606 is a wasteful number, since it uses less digits than its factorization.

521606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259.

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

The square root of 521606 is about 722.2229572646. Note that the first 3 decimals coincide. The cubic root of 521606 is about 80.4972158033.

The spelling of 521606 in words is "five hundred twenty-one thousand, six hundred six".