505005091 has 2 divisors, whose sum is σ = 505005092. Its totient is φ = 505005090.

The previous prime is 505005049. The next prime is 505005121. The reversal of 505005091 is 190500505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505005091 - 2¹¹ = 505003043 is a prime.

It is not a weakly prime, because it can be changed into another prime (505005001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252502545 + 252502546.

It is an arithmetic number, because the mean of its divisors is an integer number (252502546).

Almost surely, 2^505005091 is an apocalyptic number.

505005091 is a deficient number, since it is larger than the sum of its proper divisors (1).

505005091 is an equidigital number, since it uses as much as digits as its factorization.

505005091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125, while the sum is 25.

The square root of 505005091 is about 22472.3183272220. The cubic root of 505005091 is about 796.3401001791.

Adding to 505005091 its reverse (190500505), we get a palindrome (695505596).

The spelling of 505005091 in words is "five hundred five million, five thousand, ninety-one".