521315225 has 6 divisors (see below), whose sum is σ = 646430910. Its totient is φ = 417052160.

The previous prime is 521315219. The next prime is 521315227. The reversal of 521315225 is 522513125.

It can be written as a sum of positive squares in 3 ways, for example, as 5480281 + 515834944 = 2341^2 + 22712^2 .

It is not a de Polignac number, because 521315225 - 2⁶ = 521315161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521315194 and 521315203.

It is not an unprimeable number, because it can be changed into a prime (521315227) 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, 10426280 + ... + 10426329.

It is an arithmetic number, because the mean of its divisors is an integer number (107738485).

Almost surely, 2^521315225 is an apocalyptic number.

It is an amenable number.

521315225 is a deficient number, since it is larger than the sum of its proper divisors (125115685).

521315225 is a wasteful number, since it uses less digits than its factorization.

521315225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20852619 (or 20852614 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 521315225 is about 22832.3285058708. The cubic root of 521315225 is about 804.8225500358.

The spelling of 521315225 in words is "five hundred twenty-one million, three hundred fifteen thousand, two hundred twenty-five".