216149 has 2 divisors, whose sum is σ = 216150. Its totient is φ = 216148.

The previous prime is 216133. The next prime is 216157. The reversal of 216149 is 941612.

It is a happy number.

216149 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., 145924 + 70225 = 382^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 216149 - 2⁴ = 216133 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 (216119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108074 + 108075.

It is an arithmetic number, because the mean of its divisors is an integer number (108075).

2²¹⁶¹⁴⁹ is an apocalyptic number.

It is an amenable number.

216149 is a deficient number, since it is larger than the sum of its proper divisors (1).

216149 is an equidigital number, since it uses as much as digits as its factorization.

216149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 216149 is about 464.9182723877. The cubic root of 216149 is about 60.0137931252.

The spelling of 216149 in words is "two hundred sixteen thousand, one hundred forty-nine".