521858489 has 4 divisors (see below), whose sum is σ = 522212340. Its totient is φ = 521504640.

The previous prime is 521858419. The next prime is 521858497. The reversal of 521858489 is 984858125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160858489 + 361000000 = 12683^2 + 19000^2 .

It is a cyclic number.

It is not a de Polignac number, because 521858489 - 2¹² = 521854393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521858419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174704 + ... + 177665.

It is an arithmetic number, because the mean of its divisors is an integer number (130553085).

Almost surely, 2^521858489 is an apocalyptic number.

It is an amenable number.

521858489 is a deficient number, since it is larger than the sum of its proper divisors (353851).

521858489 is a wasteful number, since it uses less digits than its factorization.

521858489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353850.

The product of its digits is 921600, while the sum is 50.

The square root of 521858489 is about 22844.2222235733. Note that the first 5 decimals coincide. The cubic root of 521858489 is about 805.1020222277.

The spelling of 521858489 in words is "five hundred twenty-one million, eight hundred fifty-eight thousand, four hundred eighty-nine".