4218181 has 12 divisors (see below), whose sum is σ = 4711392. Its totient is φ = 3773000.

The previous prime is 4218173. The next prime is 4218199. The reversal of 4218181 is 1818124.

It is not a de Polignac number, because 4218181 - 2³ = 4218173 is a prime.

It is a super-2 number, since 2×4218181² = 35586101897522, 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 (4218281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8346 + ... + 8836.

It is an arithmetic number, because the mean of its divisors is an integer number (392616).

Almost surely, 2^4218181 is an apocalyptic number.

It is an amenable number.

4218181 is a deficient number, since it is larger than the sum of its proper divisors (493211).

4218181 is a wasteful number, since it uses less digits than its factorization.

4218181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 573 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

The square root of 4218181 is about 2053.8210730246. The cubic root of 4218181 is about 161.5753369912.

The spelling of 4218181 in words is "four million, two hundred eighteen thousand, one hundred eighty-one".