521227225 has 12 divisors (see below), whose sum is σ = 684341244. Its totient is φ = 392453120.

The previous prime is 521227183. The next prime is 521227229. The reversal of 521227225 is 522722125.

It can be written as a sum of positive squares in 6 ways, for example, as 8838729 + 512388496 = 2973^2 + 22636^2 .

It is not a de Polignac number, because 521227225 - 2¹⁷ = 521096153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521227193 and 521227202.

It is not an unprimeable number, because it can be changed into a prime (521227229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612784 + ... + 613633.

It is an arithmetic number, because the mean of its divisors is an integer number (57028437).

Almost surely, 2^521227225 is an apocalyptic number.

It is an amenable number.

521227225 is a deficient number, since it is larger than the sum of its proper divisors (163114019).

521227225 is a wasteful number, since it uses less digits than its factorization.

521227225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226444 (or 1226439 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 521227225 is about 22830.4013324339. The cubic root of 521227225 is about 804.7772617812. Note that the first 3 decimals are identical.

The spelling of 521227225 in words is "five hundred twenty-one million, two hundred twenty-seven thousand, two hundred twenty-five".