521373225 has 12 divisors (see below), whose sum is σ = 862003856. Its totient is φ = 278065680.

The previous prime is 521373217. The next prime is 521373233. The reversal of 521373225 is 522373125.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (521373217) and next prime (521373233).

It is not a de Polignac number, because 521373225 - 2³ = 521373217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521373192 and 521373201.

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, 3475747 + ... + 3475896.

Almost surely, 2^521373225 is an apocalyptic number.

It is an amenable number.

521373225 is a deficient number, since it is larger than the sum of its proper divisors (340630631).

521373225 is a wasteful number, since it uses less digits than its factorization.

521373225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951656 (or 6951651 counting only the distinct ones).

The product of its digits is 12600, while the sum is 30.

The square root of 521373225 is about 22833.5985994324. The cubic root of 521373225 is about 804.8523963263.

The spelling of 521373225 in words is "five hundred twenty-one million, three hundred seventy-three thousand, two hundred twenty-five".