5218681 has 8 divisors (see below), whose sum is σ = 5647880. Its totient is φ = 4793472.

The previous prime is 5218669. The next prime is 5218691. The reversal of 5218681 is 1868125.

It can be written as a sum of positive squares in 4 ways, for example, as 115600 + 5103081 = 340^2 + 2259^2 .

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 5218681 - 2⁷ = 5218553 is a prime.

It is a super-2 number, since 2×5218681² = 54469262759522, which contains 22 as substring.

It is a Duffinian number.

5218681 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (5218601) 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 7 ways as a sum of consecutive naturals, for example, 2101 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (705985).

Almost surely, 2^5218681 is an apocalyptic number.

It is an amenable number.

5218681 is a deficient number, since it is larger than the sum of its proper divisors (429199).

5218681 is a wasteful number, since it uses less digits than its factorization.

5218681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995.

The product of its digits is 3840, while the sum is 31.

The square root of 5218681 is about 2284.4432582141. The cubic root of 5218681 is about 173.4550373901.

The spelling of 5218681 in words is "five million, two hundred eighteen thousand, six hundred eighty-one".