505509997 has 2 divisors, whose sum is σ = 505509998. Its totient is φ = 505509996.

The previous prime is 505509937. The next prime is 505510001. The reversal of 505509997 is 799905505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257730916 + 247779081 = 16054^2 + 15741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505509997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505509997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505509937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252754998 + 252754999.

It is an arithmetic number, because the mean of its divisors is an integer number (252754999).

Almost surely, 2^505509997 is an apocalyptic number.

It is an amenable number.

505509997 is a deficient number, since it is larger than the sum of its proper divisors (1).

505509997 is an equidigital number, since it uses as much as digits as its factorization.

505509997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 637875, while the sum is 49.

The square root of 505509997 is about 22483.5494751162. The cubic root of 505509997 is about 796.6054063953.

The spelling of 505509997 in words is "five hundred five million, five hundred nine thousand, nine hundred ninety-seven".