518993801 has 4 divisors (see below), whose sum is σ = 522299652. Its totient is φ = 515687952.

The previous prime is 518993779. The next prime is 518993803. The reversal of 518993801 is 108399815.

It is a happy number.

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 234059401 + 284934400 = 15299^2 + 16880^2 .

It is a cyclic number.

It is not a de Polignac number, because 518993801 - 2⁶ = 518993737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518993803) 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, 1652690 + ... + 1653003.

It is an arithmetic number, because the mean of its divisors is an integer number (130574913).

Almost surely, 2^518993801 is an apocalyptic number.

It is an amenable number.

518993801 is a deficient number, since it is larger than the sum of its proper divisors (3305851).

518993801 is a wasteful number, since it uses less digits than its factorization.

518993801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305850.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 518993801 is about 22781.4354464331. The cubic root of 518993801 is about 803.6261437065.

The spelling of 518993801 in words is "five hundred eighteen million, nine hundred ninety-three thousand, eight hundred one".