218709441 has 6 divisors (see below), whose sum is σ = 315913650. Its totient is φ = 145806288.

The previous prime is 218709419. The next prime is 218709473. The reversal of 218709441 is 144907812.

It can be written as a sum of positive squares in only one way, i.e., 211091841 + 7617600 = 14529^2 + 2760^2 .

It is not a de Polignac number, because 218709441 - 2¹¹ = 218707393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218709396 and 218709405.

It is not an unprimeable number, because it can be changed into a prime (218709341) 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 5 ways as a sum of consecutive naturals, for example, 12150516 + ... + 12150533.

It is an arithmetic number, because the mean of its divisors is an integer number (52652275).

Almost surely, 2^218709441 is an apocalyptic number.

It is an amenable number.

218709441 is a deficient number, since it is larger than the sum of its proper divisors (97204209).

218709441 is a wasteful number, since it uses less digits than its factorization.

218709441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24301055 (or 24301052 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 218709441 is about 14788.8282497296. The cubic root of 218709441 is about 602.4983245191.

The spelling of 218709441 in words is "two hundred eighteen million, seven hundred nine thousand, four hundred forty-one".