489051809 has 2 divisors, whose sum is σ = 489051810. Its totient is φ = 489051808.

The previous prime is 489051769. The next prime is 489051817. The reversal of 489051809 is 908150984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488277409 + 774400 = 22097^2 + 880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489051809 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 489051809.

It is not a weakly prime, because it can be changed into another prime (489051109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244525904 + 244525905.

It is an arithmetic number, because the mean of its divisors is an integer number (244525905).

Almost surely, 2^489051809 is an apocalyptic number.

It is an amenable number.

489051809 is a deficient number, since it is larger than the sum of its proper divisors (1).

489051809 is an equidigital number, since it uses as much as digits as its factorization.

489051809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 489051809 is about 22114.5157984524. The cubic root of 489051809 is about 787.8646650393.

The spelling of 489051809 in words is "four hundred eighty-nine million, fifty-one thousand, eight hundred nine".