30218181 has 8 divisors (see below), whose sum is σ = 46046784. Its totient is φ = 17267520.

The previous prime is 30218161. The next prime is 30218213. The reversal of 30218181 is 18181203.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30218181 - 2¹⁴ = 30201797 is a prime.

It is a super-2 number, since 2×30218181² = 1826276925897522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30218101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719460 + ... + 719501.

It is an arithmetic number, because the mean of its divisors is an integer number (5755848).

Almost surely, 2^30218181 is an apocalyptic number.

It is an amenable number.

30218181 is a deficient number, since it is larger than the sum of its proper divisors (15828603).

30218181 is a wasteful number, since it uses less digits than its factorization.

30218181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438971.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 30218181 is about 5497.1066025683. The cubic root of 30218181 is about 311.4746975077.

Adding to 30218181 its reverse (18181203), we get a palindrome (48399384).

The spelling of 30218181 in words is "thirty million, two hundred eighteen thousand, one hundred eighty-one".