5555509 has 2 divisors, whose sum is σ = 5555510. Its totient is φ = 5555508.

The previous prime is 5555507. The next prime is 5555527. The reversal of 5555509 is 9055555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3724900 + 1830609 = 1930^2 + 1353^2 .

It is a cyclic number.

It is not a de Polignac number, because 5555509 - 2¹ = 5555507 is a prime.

Together with 5555507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5555507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777754 + 2777755.

It is an arithmetic number, because the mean of its divisors is an integer number (2777755).

Almost surely, 2^5555509 is an apocalyptic number.

It is an amenable number.

5555509 is a deficient number, since it is larger than the sum of its proper divisors (1).

5555509 is an equidigital number, since it uses as much as digits as its factorization.

5555509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28125, while the sum is 34.

The square root of 5555509 is about 2357.0127280098. The cubic root of 5555509 is about 177.1092668025.

The spelling of 5555509 in words is "five million, five hundred fifty-five thousand, five hundred nine".