489847681 has 2 divisors, whose sum is σ = 489847682. Its totient is φ = 489847680.

The previous prime is 489847679. The next prime is 489847691. The reversal of 489847681 is 186748984.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389667600 + 100180081 = 19740^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 489847681 - 2¹ = 489847679 is a prime.

It is a super-2 number, since 2×489847681² = 479901501162155522, which contains 22 as substring.

Together with 489847679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (489847601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244923840 + 244923841.

It is an arithmetic number, because the mean of its divisors is an integer number (244923841).

Almost surely, 2^489847681 is an apocalyptic number.

It is an amenable number.

489847681 is a deficient number, since it is larger than the sum of its proper divisors (1).

489847681 is an equidigital number, since it uses as much as digits as its factorization.

489847681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 55.

The square root of 489847681 is about 22132.5028182535. The cubic root of 489847681 is about 788.2918178679.

It can be divided in two parts, 48984 and 7681, that added together give a palindrome (56665).

The spelling of 489847681 in words is "four hundred eighty-nine million, eight hundred forty-seven thousand, six hundred eighty-one".