489145721 has 2 divisors, whose sum is σ = 489145722. Its totient is φ = 489145720.

The previous prime is 489145711. The next prime is 489145733. The reversal of 489145721 is 127541984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486820096 + 2325625 = 22064^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 489145721 - 2¹⁴ = 489129337 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 (489145711) 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, 244572860 + 244572861.

It is an arithmetic number, because the mean of its divisors is an integer number (244572861).

Almost surely, 2^489145721 is an apocalyptic number.

It is an amenable number.

489145721 is a deficient number, since it is larger than the sum of its proper divisors (1).

489145721 is an equidigital number, since it uses as much as digits as its factorization.

489145721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 41.

The square root of 489145721 is about 22116.6390077697. The cubic root of 489145721 is about 787.9150926965.

The spelling of 489145721 in words is "four hundred eighty-nine million, one hundred forty-five thousand, seven hundred twenty-one".