521012225 has 6 divisors (see below), whose sum is σ = 646055190. Its totient is φ = 416809760.

The previous prime is 521012203. The next prime is 521012227. The reversal of 521012225 is 522210125.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 42627841 + 478384384 = 6529^2 + 21872^2 .

It is not a de Polignac number, because 521012225 - 2¹⁰ = 521011201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521012197 and 521012206.

It is not an unprimeable number, because it can be changed into a prime (521012227) 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, 10420220 + ... + 10420269.

It is an arithmetic number, because the mean of its divisors is an integer number (107675865).

Almost surely, 2^521012225 is an apocalyptic number.

It is an amenable number.

521012225 is a deficient number, since it is larger than the sum of its proper divisors (125042965).

521012225 is a wasteful number, since it uses less digits than its factorization.

521012225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20840499 (or 20840494 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 521012225 is about 22825.6922129429. The cubic root of 521012225 is about 804.6665928963. Note that the first 3 decimals are identical.

The spelling of 521012225 in words is "five hundred twenty-one million, twelve thousand, two hundred twenty-five".