521465225 has 12 divisors (see below), whose sum is σ = 684653724. Its totient is φ = 392632320.

The previous prime is 521465213. The next prime is 521465237. The reversal of 521465225 is 522564125.

It is an interprime number because it is at equal distance from previous prime (521465213) and next prime (521465237).

It can be written as a sum of positive squares in 6 ways, for example, as 1032256 + 520432969 = 1016^2 + 22813^2 .

It is not a de Polignac number, because 521465225 - 2⁴ = 521465209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521465191 and 521465200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613064 + ... + 613913.

It is an arithmetic number, because the mean of its divisors is an integer number (57054477).

Almost surely, 2^521465225 is an apocalyptic number.

It is an amenable number.

521465225 is a deficient number, since it is larger than the sum of its proper divisors (163188499).

521465225 is a wasteful number, since it uses less digits than its factorization.

521465225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227004 (or 1226999 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 521465225 is about 22835.6130857045. The cubic root of 521465225 is about 804.8997341782.

The spelling of 521465225 in words is "five hundred twenty-one million, four hundred sixty-five thousand, two hundred twenty-five".