521513 has 4 divisors (see below), whose sum is σ = 538368. Its totient is φ = 504660.

The previous prime is 521503. The next prime is 521519. The reversal of 521513 is 315125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521513 - 2⁴ = 521497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521491 and 521500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8381 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (134592).

2⁵²¹⁵¹³ is an apocalyptic number.

It is an amenable number.

521513 is a deficient number, since it is larger than the sum of its proper divisors (16855).

521513 is a wasteful number, since it uses less digits than its factorization.

521513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16854.

The product of its digits is 150, while the sum is 17.

The square root of 521513 is about 722.1585698446. The cubic root of 521513 is about 80.4924314220.

Adding to 521513 its reverse (315125), we get a palindrome (836638).

The spelling of 521513 in words is "five hundred twenty-one thousand, five hundred thirteen".