722549221 has 2 divisors, whose sum is σ = 722549222. Its totient is φ = 722549220.

The previous prime is 722549207. The next prime is 722549227. The reversal of 722549221 is 122945227.

It is a happy number.

722549221 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., 640646721 + 81902500 = 25311^2 + 9050^2 .

It is an emirp because it is prime and its reverse (122945227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722549221 - 2¹¹ = 722547173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722549227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361274610 + 361274611.

It is an arithmetic number, because the mean of its divisors is an integer number (361274611).

Almost surely, 2^722549221 is an apocalyptic number.

It is an amenable number.

722549221 is a deficient number, since it is larger than the sum of its proper divisors (1).

722549221 is an equidigital number, since it uses as much as digits as its factorization.

722549221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 722549221 is about 26880.2756868303. The cubic root of 722549221 is about 897.3374895793.

The spelling of 722549221 in words is "seven hundred twenty-two million, five hundred forty-nine thousand, two hundred twenty-one".