622581221 has 2 divisors, whose sum is σ = 622581222. Its totient is φ = 622581220.

The previous prime is 622581161. The next prime is 622581241. The reversal of 622581221 is 122185226.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602457025 + 20124196 = 24545^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 622581221 - 2¹⁸ = 622319077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622581241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311290610 + 311290611.

It is an arithmetic number, because the mean of its divisors is an integer number (311290611).

Almost surely, 2^622581221 is an apocalyptic number.

It is an amenable number.

622581221 is a deficient number, since it is larger than the sum of its proper divisors (1).

622581221 is an equidigital number, since it uses as much as digits as its factorization.

622581221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

The square root of 622581221 is about 24951.5775252788. The cubic root of 622581221 is about 853.8835997423.

The spelling of 622581221 in words is "six hundred twenty-two million, five hundred eighty-one thousand, two hundred twenty-one".