218149 has 2 divisors, whose sum is σ = 218150. Its totient is φ = 218148.

The previous prime is 218143. The next prime is 218171. The reversal of 218149 is 941812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152100 + 66049 = 390^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 218149 - 2⁵ = 218117 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109074 + 109075.

It is an arithmetic number, because the mean of its divisors is an integer number (109075).

2²¹⁸¹⁴⁹ is an apocalyptic number.

It is an amenable number.

218149 is a deficient number, since it is larger than the sum of its proper divisors (1).

218149 is an equidigital number, since it uses as much as digits as its factorization.

218149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 218149 is about 467.0642354109. The cubic root of 218149 is about 60.1983252110.

The spelling of 218149 in words is "two hundred eighteen thousand, one hundred forty-nine".