521431525 has 12 divisors (see below), whose sum is σ = 647198532. Its totient is φ = 416743040.

The previous prime is 521431511. The next prime is 521431529. The reversal of 521431525 is 525134125.

It can be written as a sum of positive squares in 6 ways, for example, as 186431716 + 334999809 = 13654^2 + 18303^2 .

It is not a de Polignac number, because 521431525 - 2¹⁹ = 520907237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521431493 and 521431502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521431529) 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, 17919 + ... + 36931.

It is an arithmetic number, because the mean of its divisors is an integer number (53933211).

Almost surely, 2^521431525 is an apocalyptic number.

It is an amenable number.

521431525 is a deficient number, since it is larger than the sum of its proper divisors (125767007).

521431525 is a wasteful number, since it uses less digits than its factorization.

521431525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20120 (or 20115 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 521431525 is about 22834.8751912508. The cubic root of 521431525 is about 804.8823947635.

The spelling of 521431525 in words is "five hundred twenty-one million, four hundred thirty-one thousand, five hundred twenty-five".