521013 has 4 divisors (see below), whose sum is σ = 694688. Its totient is φ = 347340.

The previous prime is 521009. The next prime is 521021. The reversal of 521013 is 310125.

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 not a de Polignac number, because 521013 - 2² = 521009 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86833 + ... + 86838.

It is an arithmetic number, because the mean of its divisors is an integer number (173672).

2⁵²¹⁰¹³ is an apocalyptic number.

It is an amenable number.

521013 is a deficient number, since it is larger than the sum of its proper divisors (173675).

521013 is a wasteful number, since it uses less digits than its factorization.

521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173674.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 521013 is about 721.8123024720. The cubic root of 521013 is about 80.4666991874.

Adding to 521013 its reverse (310125), we get a palindrome (831138).

The spelling of 521013 in words is "five hundred twenty-one thousand, thirteen".