521385989849 has 16 divisors (see below), whose sum is σ = 531528480000. Its totient is φ = 511296529920.

The previous prime is 521385989833. The next prime is 521385989857. The reversal of 521385989849 is 948989583125.

It is a cyclic number.

It is not a de Polignac number, because 521385989849 - 2⁴ = 521385989833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521385929849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48275552 + ... + 48286350.

It is an arithmetic number, because the mean of its divisors is an integer number (33220530000).

Almost surely, 2^521385989849 is an apocalyptic number.

It is an amenable number.

521385989849 is a deficient number, since it is larger than the sum of its proper divisors (10142490151).

521385989849 is a wasteful number, since it uses less digits than its factorization.

521385989849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13168.

The product of its digits is 223948800, while the sum is 71.

The spelling of 521385989849 in words is "five hundred twenty-one billion, three hundred eighty-five million, nine hundred eighty-nine thousand, eight hundred forty-nine".