505018013 has 2 divisors, whose sum is σ = 505018014. Its totient is φ = 505018012.

The previous prime is 505018009. The next prime is 505018091. The reversal of 505018013 is 310810505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489161689 + 15856324 = 22117^2 + 3982^2 .

It is a cyclic number.

It is not a de Polignac number, because 505018013 - 2² = 505018009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505018013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505015013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252509006 + 252509007.

It is an arithmetic number, because the mean of its divisors is an integer number (252509007).

Almost surely, 2^505018013 is an apocalyptic number.

It is an amenable number.

505018013 is a deficient number, since it is larger than the sum of its proper divisors (1).

505018013 is an equidigital number, since it uses as much as digits as its factorization.

505018013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 505018013 is about 22472.6058346601. The cubic root of 505018013 is about 796.3468923344.

Adding to 505018013 its reverse (310810505), we get a palindrome (815828518).

The spelling of 505018013 in words is "five hundred five million, eighteen thousand, thirteen".