489389221 has 2 divisors, whose sum is σ = 489389222. Its totient is φ = 489389220.

The previous prime is 489389209. The next prime is 489389231. The reversal of 489389221 is 122983984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384552100 + 104837121 = 19610^2 + 10239^2 .

It is a cyclic number.

It is not a de Polignac number, because 489389221 - 2⁵ = 489389189 is a prime.

It is a super-4 number, since 4×489389221⁴ (a number of 36 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489389231) 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, 244694610 + 244694611.

It is an arithmetic number, because the mean of its divisors is an integer number (244694611).

Almost surely, 2^489389221 is an apocalyptic number.

It is an amenable number.

489389221 is a deficient number, since it is larger than the sum of its proper divisors (1).

489389221 is an equidigital number, since it uses as much as digits as its factorization.

489389221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 489389221 is about 22122.1432279967. The cubic root of 489389221 is about 788.0458141357.

The spelling of 489389221 in words is "four hundred eighty-nine million, three hundred eighty-nine thousand, two hundred twenty-one".