218471841 has 18 divisors (see below), whose sum is σ = 367092882. Its totient is φ = 124840800.

The previous prime is 218471833. The next prime is 218471873. The reversal of 218471841 is 148174812.

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 62346816 = 12495^2 + 7896^2 .

It is not a de Polignac number, because 218471841 - 2³ = 218471833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218471796 and 218471805.

It is not an unprimeable number, because it can be changed into a prime (218471801) 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 17 ways as a sum of consecutive naturals, for example, 247260 + ... + 248141.

It is an arithmetic number, because the mean of its divisors is an integer number (20394049).

Almost surely, 2^218471841 is an apocalyptic number.

218471841 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

218471841 is a deficient number, since it is larger than the sum of its proper divisors (148621041).

218471841 is a wasteful number, since it uses less digits than its factorization.

218471841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495421 (or 495411 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 218471841 is about 14780.7929760213. The cubic root of 218471841 is about 602.2800661883.

The spelling of 218471841 in words is "two hundred eighteen million, four hundred seventy-one thousand, eight hundred forty-one".