505984109 has 2 divisors, whose sum is σ = 505984110. Its totient is φ = 505984108.

The previous prime is 505984103. The next prime is 505984151. The reversal of 505984109 is 901489505.

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., 396886084 + 109098025 = 19922^2 + 10445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505984109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505984103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252992054 + 252992055.

It is an arithmetic number, because the mean of its divisors is an integer number (252992055).

Almost surely, 2^505984109 is an apocalyptic number.

It is an amenable number.

505984109 is a deficient number, since it is larger than the sum of its proper divisors (1).

505984109 is an equidigital number, since it uses as much as digits as its factorization.

505984109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 505984109 is about 22494.0905350717. The cubic root of 505984109 is about 796.8543709211.

The spelling of 505984109 in words is "five hundred five million, nine hundred eighty-four thousand, one hundred nine".