508128809 has 2 divisors, whose sum is σ = 508128810. Its totient is φ = 508128808.

The previous prime is 508128779. The next prime is 508128823. The reversal of 508128809 is 908821805.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289000000 + 219128809 = 17000^2 + 14803^2 .

It is a cyclic number.

It is not a de Polignac number, because 508128809 - 2¹⁶ = 508063273 is a prime.

It is not a weakly prime, because it can be changed into another prime (508128899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254064404 + 254064405.

It is an arithmetic number, because the mean of its divisors is an integer number (254064405).

Almost surely, 2^508128809 is an apocalyptic number.

It is an amenable number.

508128809 is a deficient number, since it is larger than the sum of its proper divisors (1).

508128809 is an equidigital number, since it uses as much as digits as its factorization.

508128809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 508128809 is about 22541.7126456709. The cubic root of 508128809 is about 797.9786516777.

The spelling of 508128809 in words is "five hundred eight million, one hundred twenty-eight thousand, eight hundred nine".