505298861 has 2 divisors, whose sum is σ = 505298862. Its totient is φ = 505298860.

The previous prime is 505298851. The next prime is 505298867. The reversal of 505298861 is 168892505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472236361 + 33062500 = 21731^2 + 5750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505298861 is a prime.

It is a Sophie Germain 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 (505298867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252649430 + 252649431.

It is an arithmetic number, because the mean of its divisors is an integer number (252649431).

Almost surely, 2^505298861 is an apocalyptic number.

It is an amenable number.

505298861 is a deficient number, since it is larger than the sum of its proper divisors (1).

505298861 is an equidigital number, since it uses as much as digits as its factorization.

505298861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 505298861 is about 22478.8536406997. The cubic root of 505298861 is about 796.4944850804.

The spelling of 505298861 in words is "five hundred five million, two hundred ninety-eight thousand, eight hundred sixty-one".