539607221 has 2 divisors, whose sum is σ = 539607222. Its totient is φ = 539607220.

The previous prime is 539607193. The next prime is 539607283. The reversal of 539607221 is 122706935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353966596 + 185640625 = 18814^2 + 13625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-539607221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539607121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269803610 + 269803611.

It is an arithmetic number, because the mean of its divisors is an integer number (269803611).

Almost surely, 2^539607221 is an apocalyptic number.

It is an amenable number.

539607221 is a deficient number, since it is larger than the sum of its proper divisors (1).

539607221 is an equidigital number, since it uses as much as digits as its factorization.

539607221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 539607221 is about 23229.4472814142. The cubic root of 539607221 is about 814.1277988970.

The spelling of 539607221 in words is "five hundred thirty-nine million, six hundred seven thousand, two hundred twenty-one".