218061 has 6 divisors (see below), whose sum is σ = 314990. Its totient is φ = 145368.

The previous prime is 218047. The next prime is 218069. The reversal of 218061 is 160812.

It can be written as a sum of positive squares in only one way, i.e., 145161 + 72900 = 381^2 + 270^2 .

It is not a de Polignac number, because 218061 - 2⁷ = 217933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12106 + ... + 12123.

2²¹⁸⁰⁶¹ is an apocalyptic number.

It is an amenable number.

218061 is a deficient number, since it is larger than the sum of its proper divisors (96929).

218061 is a wasteful number, since it uses less digits than its factorization.

218061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24235 (or 24232 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 218061 is about 466.9700204510. The cubic root of 218061 is about 60.1902295744.

Adding to 218061 its reverse (160812), we get a palindrome (378873).

The spelling of 218061 in words is "two hundred eighteen thousand, sixty-one".