521001013 has 8 divisors (see below), whose sum is σ = 561288728. Its totient is φ = 480743424.

The previous prime is 521001001. The next prime is 521001031. The reversal of 521001013 is 310100125.

It can be written as a sum of positive squares in 4 ways, for example, as 11009124 + 509991889 = 3318^2 + 22583^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521001013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 521000984 and 521001002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521001113) 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, 39145 + ... + 50737.

It is an arithmetic number, because the mean of its divisors is an integer number (70161091).

Almost surely, 2^521001013 is an apocalyptic number.

It is an amenable number.

521001013 is a deficient number, since it is larger than the sum of its proper divisors (40287715).

521001013 is a wasteful number, since it uses less digits than its factorization.

521001013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15063.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 521001013 is about 22825.4466111838. The cubic root of 521001013 is about 804.6608208075.

Adding to 521001013 its reverse (310100125), we get a palindrome (831101138).

The spelling of 521001013 in words is "five hundred twenty-one million, one thousand, thirteen".