521608 has 16 divisors (see below), whose sum is σ = 988380. Its totient is φ = 258048.

The previous prime is 521603. The next prime is 521641. The reversal of 521608 is 806125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 324 = 722^2 + 18^2 .

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 616 + ... + 1192.

521608 is a Friedman number, since it can be written as 65201*8, using all its digits and the basic arithmetic operations.

2⁵²¹⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

521608 is a deficient number, since it is larger than the sum of its proper divisors (466772).

521608 is a wasteful number, since it uses less digits than its factorization.

521608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 521608 is about 722.2243418772. The cubic root of 521608 is about 80.4973186870.

The spelling of 521608 in words is "five hundred twenty-one thousand, six hundred eight".