521055228 has 12 divisors (see below), whose sum is σ = 1215795560. Its totient is φ = 173685072.

The previous prime is 521055193. The next prime is 521055277. The reversal of 521055228 is 822550125.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×521055228² = 542997101252263968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521055195 and 521055204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21710623 + ... + 21710646.

Almost surely, 2^521055228 is an apocalyptic number.

It is an amenable number.

521055228 is an abundant number, since it is smaller than the sum of its proper divisors (694740332).

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

521055228 is a wasteful number, since it uses less digits than its factorization.

521055228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43421276 (or 43421274 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 521055228 is about 22826.6341802728. The cubic root of 521055228 is about 804.6887306530.

The spelling of 521055228 in words is "five hundred twenty-one million, fifty-five thousand, two hundred twenty-eight".