521126013 has 16 divisors (see below), whose sum is σ = 706320000. Its totient is φ = 341698560.

The previous prime is 521125999. The next prime is 521126017. The reversal of 521126013 is 310621125.

It is a de Polignac number, because none of the positive numbers 2^k-521126013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521126017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92913 + ... + 98361.

It is an arithmetic number, because the mean of its divisors is an integer number (44145000).

Almost surely, 2^521126013 is an apocalyptic number.

It is an amenable number.

521126013 is a deficient number, since it is larger than the sum of its proper divisors (185193987).

521126013 is a wasteful number, since it uses less digits than its factorization.

521126013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5972.

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

The square root of 521126013 is about 22828.1846190187. The cubic root of 521126013 is about 804.7251678095.

Adding to 521126013 its reverse (310621125), we get a palindrome (831747138).

The spelling of 521126013 in words is "five hundred twenty-one million, one hundred twenty-six thousand, thirteen".