525421 has 6 divisors (see below), whose sum is σ = 569130. Its totient is φ = 484848.

The previous prime is 525409. The next prime is 525431. The reversal of 525421 is 124525.

It can be written as a sum of positive squares in 3 ways, for example, as 15625 + 509796 = 125^2 + 714^2 .

It is not a de Polignac number, because 525421 - 2¹³ = 517229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1386 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (94855).

2⁵²⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

525421 is a deficient number, since it is larger than the sum of its proper divisors (43709).

525421 is a wasteful number, since it uses less digits than its factorization.

525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135 (or 3122 counting only the distinct ones).

The product of its digits is 400, while the sum is 19.

The square root of 525421 is about 724.8592966914. The cubic root of 525421 is about 80.6929901417.

Adding to 525421 its reverse (124525), we get a palindrome (649946).

It can be divided in two parts, 525 and 421, that added together give a triangular number (946 = T₄₃).

The spelling of 525421 in words is "five hundred twenty-five thousand, four hundred twenty-one".