218585149 has 2 divisors, whose sum is σ = 218585150. Its totient is φ = 218585148.

The previous prime is 218585117. The next prime is 218585153. The reversal of 218585149 is 941585812.

218585149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149279524 + 69305625 = 12218^2 + 8325^2 .

It is a cyclic number.

It is not a de Polignac number, because 218585149 - 2⁵ = 218585117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218585249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109292574 + 109292575.

It is an arithmetic number, because the mean of its divisors is an integer number (109292575).

Almost surely, 2^218585149 is an apocalyptic number.

It is an amenable number.

218585149 is a deficient number, since it is larger than the sum of its proper divisors (1).

218585149 is an equidigital number, since it uses as much as digits as its factorization.

218585149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 43.

The square root of 218585149 is about 14784.6254264354. The cubic root of 218585149 is about 602.3841701542.

The spelling of 218585149 in words is "two hundred eighteen million, five hundred eighty-five thousand, one hundred forty-nine".