505000091 has 2 divisors, whose sum is σ = 505000092. Its totient is φ = 505000090.

The previous prime is 505000073. The next prime is 505000103. The reversal of 505000091 is 190000505.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505000091 is a prime.

It is a pancake number, because a pancake can be divided into 505000091 parts by 31780 straight cuts.

It is not a weakly prime, because it can be changed into another prime (505000591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252500045 + 252500046.

It is an arithmetic number, because the mean of its divisors is an integer number (252500046).

Almost surely, 2^505000091 is an apocalyptic number.

505000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

505000091 is an equidigital number, since it uses as much as digits as its factorization.

505000091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 505000091 is about 22472.2070789676. The cubic root of 505000091 is about 796.3374720117.

Adding to 505000091 its reverse (190000505), we get a palindrome (695000596).

The spelling of 505000091 in words is "five hundred five million, ninety-one", and thus it is an aban number.