505818557131 has 2 divisors, whose sum is σ = 505818557132. Its totient is φ = 505818557130.

The previous prime is 505818557063. The next prime is 505818557149. The reversal of 505818557131 is 131755818505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505818557131 - 2¹⁹ = 505818032843 is a prime.

It is a super-5 number, since 5×505818557131⁵ (a number of 60 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (505818557161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252909278565 + 252909278566.

It is an arithmetic number, because the mean of its divisors is an integer number (252909278566).

Almost surely, 2^505818557131 is an apocalyptic number.

505818557131 is a deficient number, since it is larger than the sum of its proper divisors (1).

505818557131 is an equidigital number, since it uses as much as digits as its factorization.

505818557131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840000, while the sum is 49.

The spelling of 505818557131 in words is "five hundred five billion, eight hundred eighteen million, five hundred fifty-seven thousand, one hundred thirty-one".