521223225 has 24 divisors (see below), whose sum is σ = 862459680. Its totient is φ = 277758720.

The previous prime is 521223203. The next prime is 521223229. The reversal of 521223225 is 522322125.

It is not a de Polignac number, because 521223225 - 2¹¹ = 521221177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521223195 and 521223204.

It is not an unprimeable number, because it can be changed into a prime (521223229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132081 + ... + 135969.

It is an arithmetic number, because the mean of its divisors is an integer number (35935820).

Almost surely, 2^521223225 is an apocalyptic number.

It is an amenable number.

521223225 is a deficient number, since it is larger than the sum of its proper divisors (341236455).

521223225 is a wasteful number, since it uses less digits than its factorization.

521223225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689 (or 5684 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 521223225 is about 22830.3137297760. The cubic root of 521223225 is about 804.7752031031.

The spelling of 521223225 in words is "five hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty-five".