218870849 has 2 divisors, whose sum is σ = 218870850. Its totient is φ = 218870848.

The previous prime is 218870837. The next prime is 218870857. The reversal of 218870849 is 948078812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115949824 + 102921025 = 10768^2 + 10145^2 .

It is a cyclic number.

It is not a de Polignac number, because 218870849 - 2¹⁶ = 218805313 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (218830849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109435424 + 109435425.

It is an arithmetic number, because the mean of its divisors is an integer number (109435425).

Almost surely, 2^218870849 is an apocalyptic number.

It is an amenable number.

218870849 is a deficient number, since it is larger than the sum of its proper divisors (1).

218870849 is an equidigital number, since it uses as much as digits as its factorization.

218870849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 218870849 is about 14794.2843355128. The cubic root of 218870849 is about 602.6465030581.

It can be divided in two parts, 2188 and 70849, that added together give a palindrome (73037).

The spelling of 218870849 in words is "two hundred eighteen million, eight hundred seventy thousand, eight hundred forty-nine".