521701056 has 84 divisors (see below), whose sum is σ = 1531903464. Its totient is φ = 169651200.

The previous prime is 521701051. The next prime is 521701079. The reversal of 521701056 is 650107125.

It is not an unprimeable number, because it can be changed into a prime (521701051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12571 + ... + 34661.

It is an arithmetic number, because the mean of its divisors is an integer number (18236946).

Almost surely, 2^521701056 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 521701056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765951732).

521701056 is an abundant number, since it is smaller than the sum of its proper divisors (1010202408).

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

521701056 is a wasteful number, since it uses less digits than its factorization.

521701056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22150 (or 22137 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 521701056 is about 22840.7761689484. The cubic root of 521701056 is about 805.0210536782.

The spelling of 521701056 in words is "five hundred twenty-one million, seven hundred one thousand, fifty-six".