489887681 has 2 divisors, whose sum is σ = 489887682. Its totient is φ = 489887680.

The previous prime is 489887669. The next prime is 489887683. The reversal of 489887681 is 186788984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413919025 + 75968656 = 20345^2 + 8716^2 .

It is a cyclic number.

It is not a de Polignac number, because 489887681 - 2⁶ = 489887617 is a prime.

It is a super-2 number, since 2×489887681² = 479979879991115522, which contains 22 as substring.

Together with 489887683, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 489887681.

It is not a weakly prime, because it can be changed into another prime (489887683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244943840 + 244943841.

It is an arithmetic number, because the mean of its divisors is an integer number (244943841).

Almost surely, 2^489887681 is an apocalyptic number.

It is an amenable number.

489887681 is a deficient number, since it is larger than the sum of its proper divisors (1).

489887681 is an equidigital number, since it uses as much as digits as its factorization.

489887681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 59.

The square root of 489887681 is about 22133.4064481724. The cubic root of 489887681 is about 788.3132740713.

The spelling of 489887681 in words is "four hundred eighty-nine million, eight hundred eighty-seven thousand, six hundred eighty-one".