505506109 has 2 divisors, whose sum is σ = 505506110. Its totient is φ = 505506108.

The previous prime is 505506107. The next prime is 505506143. The reversal of 505506109 is 901605505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504137209 + 1368900 = 22453^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 505506109 - 2¹ = 505506107 is a prime.

Together with 505506107, 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 (505506107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252753054 + 252753055.

It is an arithmetic number, because the mean of its divisors is an integer number (252753055).

Almost surely, 2^505506109 is an apocalyptic number.

It is an amenable number.

505506109 is a deficient number, since it is larger than the sum of its proper divisors (1).

505506109 is an equidigital number, since it uses as much as digits as its factorization.

505506109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 505506109 is about 22483.4630117338. The cubic root of 505506109 is about 796.6033640950.

The spelling of 505506109 in words is "five hundred five million, five hundred six thousand, one hundred nine".