5218181 has 2 divisors, whose sum is σ = 5218182. Its totient is φ = 5218180.

The previous prime is 5218151. The next prime is 5218189. The reversal of 5218181 is 1818125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4553956 + 664225 = 2134^2 + 815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5218181 is a prime.

It is a super-2 number, since 2×5218181² = 54458825897522, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 5218181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5218189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2609090 + 2609091.

It is an arithmetic number, because the mean of its divisors is an integer number (2609091).

Almost surely, 2^5218181 is an apocalyptic number.

It is an amenable number.

5218181 is a deficient number, since it is larger than the sum of its proper divisors (1).

5218181 is an equidigital number, since it uses as much as digits as its factorization.

5218181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 26.

The square root of 5218181 is about 2284.3338197383. Note that the first 3 decimals coincide. The cubic root of 5218181 is about 173.4494976577.

The spelling of 5218181 in words is "five million, two hundred eighteen thousand, one hundred eighty-one".