505541191 has 2 divisors, whose sum is σ = 505541192. Its totient is φ = 505541190.

The previous prime is 505541171. The next prime is 505541209. The reversal of 505541191 is 191145505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505541191 - 2⁵ = 505541159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505541161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252770595 + 252770596.

It is an arithmetic number, because the mean of its divisors is an integer number (252770596).

Almost surely, 2^505541191 is an apocalyptic number.

505541191 is a deficient number, since it is larger than the sum of its proper divisors (1).

505541191 is an equidigital number, since it uses as much as digits as its factorization.

505541191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 505541191 is about 22484.2431716080. The cubic root of 505541191 is about 796.6217916947.

Adding to 505541191 its reverse (191145505), we get a palindrome (696686696).

It can be divided in two parts, 505 and 541191, that added together give a square (541696 = 736²).

The spelling of 505541191 in words is "five hundred five million, five hundred forty-one thousand, one hundred ninety-one".