505124909 has 2 divisors, whose sum is σ = 505124910. Its totient is φ = 505124908.

The previous prime is 505124869. The next prime is 505124941. The reversal of 505124909 is 909421505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391169284 + 113955625 = 19778^2 + 10675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505124909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505124989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252562454 + 252562455.

It is an arithmetic number, because the mean of its divisors is an integer number (252562455).

Almost surely, 2^505124909 is an apocalyptic number.

It is an amenable number.

505124909 is a deficient number, since it is larger than the sum of its proper divisors (1).

505124909 is an equidigital number, since it uses as much as digits as its factorization.

505124909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 505124909 is about 22474.9840711846. The cubic root of 505124909 is about 796.4030753415.

The spelling of 505124909 in words is "five hundred five million, one hundred twenty-four thousand, nine hundred nine".