555128809 has 2 divisors, whose sum is σ = 555128810. Its totient is φ = 555128808.

The previous prime is 555128773. The next prime is 555128843. The reversal of 555128809 is 908821555.

555128809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384042409 + 171086400 = 19597^2 + 13080^2 .

It is a cyclic number.

It is not a de Polignac number, because 555128809 - 2¹⁹ = 554604521 is a prime.

It is not a weakly prime, because it can be changed into another prime (555128879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277564404 + 277564405.

It is an arithmetic number, because the mean of its divisors is an integer number (277564405).

Almost surely, 2^555128809 is an apocalyptic number.

It is an amenable number.

555128809 is a deficient number, since it is larger than the sum of its proper divisors (1).

555128809 is an equidigital number, since it uses as much as digits as its factorization.

555128809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 43.

The square root of 555128809 is about 23561.1716389487. The cubic root of 555128809 is about 821.8601480235.

The spelling of 555128809 in words is "five hundred fifty-five million, one hundred twenty-eight thousand, eight hundred nine".