505561513 has 2 divisors, whose sum is σ = 505561514. Its totient is φ = 505561512.

The previous prime is 505561499. The next prime is 505561517. The reversal of 505561513 is 315165505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492973209 + 12588304 = 22203^2 + 3548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505561513 is a prime.

It is not a weakly prime, because it can be changed into another prime (505561517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252780756 + 252780757.

It is an arithmetic number, because the mean of its divisors is an integer number (252780757).

Almost surely, 2^505561513 is an apocalyptic number.

It is an amenable number.

505561513 is a deficient number, since it is larger than the sum of its proper divisors (1).

505561513 is an equidigital number, since it uses as much as digits as its factorization.

505561513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 505561513 is about 22484.6950835452. The cubic root of 505561513 is about 796.6324658867.

The spelling of 505561513 in words is "five hundred five million, five hundred sixty-one thousand, five hundred thirteen".