83630221 has 2 divisors, whose sum is σ = 83630222. Its totient is φ = 83630220.

The previous prime is 83630203. The next prime is 83630233. The reversal of 83630221 is 12203638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 108900 = 9139^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 83630221 - 2⁵ = 83630189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83630251) 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, 41815110 + 41815111.

It is an arithmetic number, because the mean of its divisors is an integer number (41815111).

Almost surely, 2^83630221 is an apocalyptic number.

It is an amenable number.

83630221 is a deficient number, since it is larger than the sum of its proper divisors (1).

83630221 is an equidigital number, since it uses as much as digits as its factorization.

83630221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 83630221 is about 9144.9560414471. The cubic root of 83630221 is about 437.3083281211.

Adding to 83630221 its reverse (12203638), we get a palindrome (95833859).

The spelling of 83630221 in words is "eighty-three million, six hundred thirty thousand, two hundred twenty-one".