581742221 has 2 divisors, whose sum is σ = 581742222. Its totient is φ = 581742220.

The previous prime is 581742199. The next prime is 581742229. The reversal of 581742221 is 122247185.

581742221 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., 482022025 + 99720196 = 21955^2 + 9986^2 .

It is a cyclic number.

It is not a de Polignac number, because 581742221 - 2¹⁸ = 581480077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (581742229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290871110 + 290871111.

It is an arithmetic number, because the mean of its divisors is an integer number (290871111).

Almost surely, 2^581742221 is an apocalyptic number.

It is an amenable number.

581742221 is a deficient number, since it is larger than the sum of its proper divisors (1).

581742221 is an equidigital number, since it uses as much as digits as its factorization.

581742221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 581742221 is about 24119.3329302450. The cubic root of 581742221 is about 834.7892764298.

The spelling of 581742221 in words is "five hundred eighty-one million, seven hundred forty-two thousand, two hundred twenty-one".