216243149 has 2 divisors, whose sum is σ = 216243150. Its totient is φ = 216243148.

The previous prime is 216243091. The next prime is 216243163. The reversal of 216243149 is 941342612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162690025 + 53553124 = 12755^2 + 7318^2 .

It is a cyclic number.

It is not a de Polignac number, because 216243149 - 2¹⁶ = 216177613 is a prime.

It is a super-2 number, since 2×216243149² = 93522198978872402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216243449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108121574 + 108121575.

It is an arithmetic number, because the mean of its divisors is an integer number (108121575).

Almost surely, 2^216243149 is an apocalyptic number.

It is an amenable number.

216243149 is a deficient number, since it is larger than the sum of its proper divisors (1).

216243149 is an equidigital number, since it uses as much as digits as its factorization.

216243149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 216243149 is about 14705.2082270194. The cubic root of 216243149 is about 600.2250535373.

The spelling of 216243149 in words is "two hundred sixteen million, two hundred forty-three thousand, one hundred forty-nine".