218581441 has 8 divisors (see below), whose sum is σ = 236513984. Its totient is φ = 200808720.

The previous prime is 218581421. The next prime is 218581469. The reversal of 218581441 is 144185812.

It is a happy number.

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 218581441 - 2¹³ = 218573249 is a prime.

It is the 14785-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218581397 and 218581406.

It is not an unprimeable number, because it can be changed into a prime (218581421) by changing a digit.

It is a nontrivial repunit in base 14784.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37101 + ... + 42586.

It is an arithmetic number, because the mean of its divisors is an integer number (29564248).

Almost surely, 2^218581441 is an apocalyptic number.

It is an amenable number.

218581441 is a deficient number, since it is larger than the sum of its proper divisors (17932543).

218581441 is a wasteful number, since it uses less digits than its factorization.

218581441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79911.

The product of its digits is 10240, while the sum is 34.

The square root of 218581441 is about 14784.5000253644. The cubic root of 218581441 is about 602.3807639254.

The spelling of 218581441 in words is "two hundred eighteen million, five hundred eighty-one thousand, four hundred forty-one".