505134221 has 2 divisors, whose sum is σ = 505134222. Its totient is φ = 505134220.

The previous prime is 505134199. The next prime is 505134233. The reversal of 505134221 is 122431505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440412196 + 64722025 = 20986^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 505134221 - 2²² = 500939917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505134121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252567110 + 252567111.

It is an arithmetic number, because the mean of its divisors is an integer number (252567111).

Almost surely, 2^505134221 is an apocalyptic number.

It is an amenable number.

505134221 is a deficient number, since it is larger than the sum of its proper divisors (1).

505134221 is an equidigital number, since it uses as much as digits as its factorization.

505134221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 505134221 is about 22475.1912338916. The cubic root of 505134221 is about 796.4079692201.

Adding to 505134221 its reverse (122431505), we get a palindrome (627565726).

The spelling of 505134221 in words is "five hundred five million, one hundred thirty-four thousand, two hundred twenty-one".