505944490813 has 2 divisors, whose sum is σ = 505944490814. Its totient is φ = 505944490812.

The previous prime is 505944490789. The next prime is 505944490819. The reversal of 505944490813 is 318094449505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324286969444 + 181657521369 = 569462^2 + 426213^2 .

It is a cyclic number.

It is not a de Polignac number, because 505944490813 - 2¹³ = 505944482621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505944490819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252972245406 + 252972245407.

It is an arithmetic number, because the mean of its divisors is an integer number (252972245407).

Almost surely, 2^505944490813 is an apocalyptic number.

It is an amenable number.

505944490813 is a deficient number, since it is larger than the sum of its proper divisors (1).

505944490813 is an equidigital number, since it uses as much as digits as its factorization.

505944490813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 505944490813 in words is "five hundred five billion, nine hundred forty-four million, four hundred ninety thousand, eight hundred thirteen".