218171149 has 16 divisors (see below), whose sum is σ = 272526336. Its totient is φ = 170323200.

The previous prime is 218171131. The next prime is 218171159. The reversal of 218171149 is 941171812.

It is a cyclic number.

It is not a de Polignac number, because 218171149 - 2⁵ = 218171117 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 (218171119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25882 + ... + 33259.

It is an arithmetic number, because the mean of its divisors is an integer number (17032896).

Almost surely, 2^218171149 is an apocalyptic number.

It is an amenable number.

218171149 is a deficient number, since it is larger than the sum of its proper divisors (54355187).

218171149 is a wasteful number, since it uses less digits than its factorization.

218171149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59196.

The product of its digits is 4032, while the sum is 34.

The square root of 218171149 is about 14770.6177595929. The cubic root of 218171149 is about 602.0036248462.

The spelling of 218171149 in words is "two hundred eighteen million, one hundred seventy-one thousand, one hundred forty-nine".