489818221 has 2 divisors, whose sum is σ = 489818222. Its totient is φ = 489818220.

The previous prime is 489818213. The next prime is 489818237. The reversal of 489818221 is 122818984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272580100 + 217238121 = 16510^2 + 14739^2 .

It is a cyclic number.

It is not a de Polignac number, because 489818221 - 2³ = 489818213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489818521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244909110 + 244909111.

It is an arithmetic number, because the mean of its divisors is an integer number (244909111).

Almost surely, 2^489818221 is an apocalyptic number.

It is an amenable number.

489818221 is a deficient number, since it is larger than the sum of its proper divisors (1).

489818221 is an equidigital number, since it uses as much as digits as its factorization.

489818221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 489818221 is about 22131.8372712254. The cubic root of 489818221 is about 788.2760146271.

The spelling of 489818221 in words is "four hundred eighty-nine million, eight hundred eighteen thousand, two hundred twenty-one".