521543425 has 24 divisors (see below), whose sum is σ = 737437176. Its totient is φ = 362480640.

The previous prime is 521543417. The next prime is 521543437. The reversal of 521543425 is 524345125.

It can be written as a sum of positive squares in 12 ways, for example, as 195524289 + 326019136 = 13983^2 + 18056^2 .

It is not a de Polignac number, because 521543425 - 2³ = 521543417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41674 + ... + 52723.

It is an arithmetic number, because the mean of its divisors is an integer number (30726549).

Almost surely, 2^521543425 is an apocalyptic number.

It is an amenable number.

521543425 is a deficient number, since it is larger than the sum of its proper divisors (215893751).

521543425 is a wasteful number, since it uses less digits than its factorization.

521543425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94437 (or 94432 counting only the distinct ones).

The product of its digits is 24000, while the sum is 31.

The square root of 521543425 is about 22837.3252593205. The cubic root of 521543425 is about 804.9399669749.

The spelling of 521543425 in words is "five hundred twenty-one million, five hundred forty-three thousand, four hundred twenty-five".