581745222221 has 2 divisors, whose sum is σ = 581745222222. Its totient is φ = 581745222220.

The previous prime is 581745222143. The next prime is 581745222239. The reversal of 581745222221 is 122222547185.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555017550025 + 26727672196 = 744995^2 + 163486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-581745222221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581745222271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290872611110 + 290872611111.

It is an arithmetic number, because the mean of its divisors is an integer number (290872611111).

Almost surely, 2^581745222221 is an apocalyptic number.

It is an amenable number.

581745222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

581745222221 is an equidigital number, since it uses as much as digits as its factorization.

581745222221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179200, while the sum is 41.

The spelling of 581745222221 in words is "five hundred eighty-one billion, seven hundred forty-five million, two hundred twenty-two thousand, two hundred twenty-one".