521354224 has 40 divisors (see below), whose sum is σ = 1068074000. Its totient is φ = 245846016.

The previous prime is 521354219. The next prime is 521354233. The reversal of 521354224 is 422453125.

It is a junction number, because it is equal to n+sod(n) for n = 521354192 and 521354201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65872 + ... + 73360.

It is an arithmetic number, because the mean of its divisors is an integer number (26701850).

Almost surely, 2^521354224 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 521354224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534037000).

521354224 is an abundant number, since it is smaller than the sum of its proper divisors (546719776).

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

521354224 is a wasteful number, since it uses less digits than its factorization.

521354224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745 (or 7739 counting only the distinct ones).

The product of its digits is 9600, while the sum is 28.

The square root of 521354224 is about 22833.1825201832. The cubic root of 521354224 is about 804.8426188224.

The spelling of 521354224 in words is "five hundred twenty-one million, three hundred fifty-four thousand, two hundred twenty-four".