518384160121 has 3 divisors (see below), whose sum is σ = 518384880111. Its totient is φ = 518383440132.

The previous prime is 518384160101. The next prime is 518384160157. The reversal of 518384160121 is 121061483815.

The square root of 518384160121 is 719989.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 487118847721 + 31265312400 = 697939^2 + 176820^2 .

It is not a de Polignac number, because 518384160121 - 2²¹ = 518382062969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518384160101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 359995 + ... + 1079983.

It is an arithmetic number, because the mean of its divisors is an integer number (172794960037).

Almost surely, 2^518384160121 is an apocalyptic number.

518384160121 is the 719989-th square number.

518384160121 is the 359995-th centered octagonal number.

It is an amenable number.

518384160121 is a deficient number, since it is larger than the sum of its proper divisors (719990).

518384160121 is an frugal number, since it uses more digits than its factorization.

518384160121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439978 (or 719989 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 518384160121 in words is "five hundred eighteen billion, three hundred eighty-four million, one hundred sixty thousand, one hundred twenty-one".