518280197 has 4 divisors (see below), whose sum is σ = 524103660. Its totient is φ = 512456736.

The previous prime is 518280193. The next prime is 518280209. The reversal of 518280197 is 791082815.

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 140327716 + 377952481 = 11846^2 + 19441^2 .

It is a cyclic number.

It is not a de Polignac number, because 518280197 - 2² = 518280193 is a prime.

It is a super-2 number, since 2×518280197² = 537228725204717618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518280193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2911598 + ... + 2911775.

It is an arithmetic number, because the mean of its divisors is an integer number (131025915).

Almost surely, 2^518280197 is an apocalyptic number.

It is an amenable number.

518280197 is a deficient number, since it is larger than the sum of its proper divisors (5823463).

518280197 is an equidigital number, since it uses as much as digits as its factorization.

518280197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823462.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 518280197 is about 22765.7680959813. The cubic root of 518280197 is about 803.2576525565.

The spelling of 518280197 in words is "five hundred eighteen million, two hundred eighty thousand, one hundred ninety-seven".