489755809 has 2 divisors, whose sum is σ = 489755810. Its totient is φ = 489755808.

The previous prime is 489755801. The next prime is 489755821. The reversal of 489755809 is 908557984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246395809 + 243360000 = 15697^2 + 15600^2 .

It is a cyclic number.

It is not a de Polignac number, because 489755809 - 2³ = 489755801 is a prime.

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 489755809.

It is not a weakly prime, because it can be changed into another prime (489755801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244877904 + 244877905.

It is an arithmetic number, because the mean of its divisors is an integer number (244877905).

Almost surely, 2^489755809 is an apocalyptic number.

It is an amenable number.

489755809 is a deficient number, since it is larger than the sum of its proper divisors (1).

489755809 is an equidigital number, since it uses as much as digits as its factorization.

489755809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 489755809 is about 22130.4272213620. The cubic root of 489755809 is about 788.2425328372.

It can be divided in two parts, 4897 and 55809, that added together give a palindrome (60706).

The spelling of 489755809 in words is "four hundred eighty-nine million, seven hundred fifty-five thousand, eight hundred nine".