611630221 has 2 divisors, whose sum is σ = 611630222. Its totient is φ = 611630220.

The previous prime is 611630207. The next prime is 611630231. The reversal of 611630221 is 122036116.

611630221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 585107721 + 26522500 = 24189^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 611630221 - 2¹⁵ = 611597453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 611630192 and 611630201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611630231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305815110 + 305815111.

It is an arithmetic number, because the mean of its divisors is an integer number (305815111).

Almost surely, 2^611630221 is an apocalyptic number.

It is an amenable number.

611630221 is a deficient number, since it is larger than the sum of its proper divisors (1).

611630221 is an equidigital number, since it uses as much as digits as its factorization.

611630221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 611630221 is about 24731.1589093597. The cubic root of 611630221 is about 848.8474441288.

Adding to 611630221 its reverse (122036116), we get a palindrome (733666337).

The spelling of 611630221 in words is "six hundred eleven million, six hundred thirty thousand, two hundred twenty-one".