520198505 has 8 divisors (see below), whose sum is σ = 624366792. Its totient is φ = 416073088.

The previous prime is 520198501. The next prime is 520198531. The reversal of 520198505 is 505891025.

It can be written as a sum of positive squares in 4 ways, for example, as 1087849 + 519110656 = 1043^2 + 22784^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 520198505 - 2² = 520198501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520198501) 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, 30167 + ... + 44163.

It is an arithmetic number, because the mean of its divisors is an integer number (78045849).

Almost surely, 2^520198505 is an apocalyptic number.

It is an amenable number.

520198505 is a deficient number, since it is larger than the sum of its proper divisors (104168287).

520198505 is a wasteful number, since it uses less digits than its factorization.

520198505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21435.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 520198505 is about 22807.8605967329. The cubic root of 520198505 is about 804.2474635932.

The spelling of 520198505 in words is "five hundred twenty million, one hundred ninety-eight thousand, five hundred five".