506630221 has 2 divisors, whose sum is σ = 506630222. Its totient is φ = 506630220.

The previous prime is 506630207. The next prime is 506630237. The reversal of 506630221 is 122036605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505620196 + 1010025 = 22486^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 506630221 - 2⁷ = 506630093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506633221) 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, 253315110 + 253315111.

It is an arithmetic number, because the mean of its divisors is an integer number (253315111).

Almost surely, 2^506630221 is an apocalyptic number.

It is an amenable number.

506630221 is a deficient number, since it is larger than the sum of its proper divisors (1).

506630221 is an equidigital number, since it uses as much as digits as its factorization.

506630221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 506630221 is about 22508.4477696708. The cubic root of 506630221 is about 797.1934054019.

Adding to 506630221 its reverse (122036605), we get a palindrome (628666826).

The spelling of 506630221 in words is "five hundred six million, six hundred thirty thousand, two hundred twenty-one".