521198985 has 16 divisors (see below), whose sum is σ = 834376320. Its totient is φ = 277820160.

The previous prime is 521198981. The next prime is 521198989. The reversal of 521198985 is 589891125.

It is an interprime number because it is at equal distance from previous prime (521198981) and next prime (521198989).

It is not a de Polignac number, because 521198985 - 2² = 521198981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521198981) 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, 22065 + ... + 39105.

It is an arithmetic number, because the mean of its divisors is an integer number (52148520).

Almost surely, 2^521198985 is an apocalyptic number.

It is an amenable number.

521198985 is a deficient number, since it is larger than the sum of its proper divisors (313177335).

521198985 is a wasteful number, since it uses less digits than its factorization.

521198985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19088.

The product of its digits is 259200, while the sum is 48.

The square root of 521198985 is about 22829.7828504785. The cubic root of 521198985 is about 804.7627272882.

It can be divided in two parts, 5211 and 98985, that added together give a triangular number (104196 = T₄₅₆).

The spelling of 521198985 in words is "five hundred twenty-one million, one hundred ninety-eight thousand, nine hundred eighty-five".