521424013 has 4 divisors (see below), whose sum is σ = 568826208. Its totient is φ = 474021820.

The previous prime is 521423971. The next prime is 521424041. The reversal of 521424013 is 310424125.

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 521424013 - 2¹³ = 521415821 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 (521424073) 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, 23701081 + ... + 23701102.

It is an arithmetic number, because the mean of its divisors is an integer number (142206552).

Almost surely, 2^521424013 is an apocalyptic number.

It is an amenable number.

521424013 is a deficient number, since it is larger than the sum of its proper divisors (47402195).

521424013 is a wasteful number, since it uses less digits than its factorization.

521424013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47402194.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 521424013 is about 22834.7107054151. The cubic root of 521424013 is about 804.8785295672.

Adding to 521424013 its reverse (310424125), we get a palindrome (831848138).

The spelling of 521424013 in words is "five hundred twenty-one million, four hundred twenty-four thousand, thirteen".