521056 has 24 divisors (see below), whose sum is σ = 1081080. Its totient is φ = 246528.

The previous prime is 521051. The next prime is 521063. The reversal of 521056 is 650125.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521051) 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, 180 + ... + 1036.

It is an arithmetic number, because the mean of its divisors is an integer number (45045).

2⁵²¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540540).

521056 is an abundant number, since it is smaller than the sum of its proper divisors (560024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521056 is a wasteful number, since it uses less digits than its factorization.

521056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 878 counting only the distinct ones).

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

The square root of 521056 is about 721.8420879943. The cubic root of 521056 is about 80.4689128064.

The spelling of 521056 in words is "five hundred twenty-one thousand, fifty-six".