521534 has 12 divisors (see below), whose sum is σ = 847656. Its totient is φ = 240552.

The previous prime is 521533. The next prime is 521537. The reversal of 521534 is 435125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434 + ... + 1109.

It is an arithmetic number, because the mean of its divisors is an integer number (70638).

2⁵²¹⁵³⁴ is an apocalyptic number.

521534 is a deficient number, since it is larger than the sum of its proper divisors (326122).

521534 is a wasteful number, since it uses less digits than its factorization.

521534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1558 counting only the distinct ones).

The product of its digits is 600, while the sum is 20.

The square root of 521534 is about 722.1731094412. The cubic root of 521534 is about 80.4935118158.

Adding to 521534 its reverse (435125), we get a palindrome (956659).

It can be divided in two parts, 5215 and 34, that multiplied together give a triangular number (177310 = T₅₉₅).

The spelling of 521534 in words is "five hundred twenty-one thousand, five hundred thirty-four".