521612013 has 8 divisors (see below), whose sum is σ = 748981408. Its totient is φ = 320991984.

The previous prime is 521612011. The next prime is 521612033. The reversal of 521612013 is 310216125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521612013 - 2¹ = 521612011 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521612011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6687295 + ... + 6687372.

It is an arithmetic number, because the mean of its divisors is an integer number (93622676).

Almost surely, 2^521612013 is an apocalyptic number.

It is an amenable number.

521612013 is a deficient number, since it is larger than the sum of its proper divisors (227369395).

521612013 is a wasteful number, since it uses less digits than its factorization.

521612013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13374683.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 521612013 is about 22838.8268744259. The cubic root of 521612013 is about 804.9752512227.

Adding to 521612013 its reverse (310216125), we get a palindrome (831828138).

The spelling of 521612013 in words is "five hundred twenty-one million, six hundred twelve thousand, thirteen".