521554228 has 18 divisors (see below), whose sum is σ = 983239586. Its totient is φ = 240641328.

The previous prime is 521554223. The next prime is 521554247. The reversal of 521554228 is 822455125.

It can be written as a sum of positive squares in only one way, i.e., 361076004 + 160478224 = 19002^2 + 12668^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521554193 and 521554202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521554223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163101 + ... + 166267.

Almost surely, 2^521554228 is an apocalyptic number.

It is an amenable number.

521554228 is a deficient number, since it is larger than the sum of its proper divisors (461685358).

521554228 is an equidigital number, since it uses as much as digits as its factorization.

521554228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351 (or 3182 counting only the distinct ones).

The product of its digits is 32000, while the sum is 34.

The square root of 521554228 is about 22837.5617787889. The cubic root of 521554228 is about 804.9455246498.

The spelling of 521554228 in words is "five hundred twenty-one million, five hundred fifty-four thousand, two hundred twenty-eight".