505071997 has 2 divisors, whose sum is σ = 505071998. Its totient is φ = 505071996.

The previous prime is 505071971. The next prime is 505072121. The reversal of 505071997 is 799170505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388129401 + 116942596 = 19701^2 + 10814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505071997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505071947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252535998 + 252535999.

It is an arithmetic number, because the mean of its divisors is an integer number (252535999).

Almost surely, 2^505071997 is an apocalyptic number.

It is an amenable number.

505071997 is a deficient number, since it is larger than the sum of its proper divisors (1).

505071997 is an equidigital number, since it uses as much as digits as its factorization.

505071997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 505071997 is about 22473.8069093779. The cubic root of 505071997 is about 796.3752665427.

The spelling of 505071997 in words is "five hundred five million, seventy-one thousand, nine hundred ninety-seven".