1244573221 has 2 divisors, whose sum is σ = 1244573222. Its totient is φ = 1244573220.

The previous prime is 1244573219. The next prime is 1244573243. The reversal of 1244573221 is 1223754421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198128996 + 46444225 = 34614^2 + 6815^2 .

It is an emirp because it is prime and its reverse (1223754421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1244573221 - 2¹ = 1244573219 is a prime.

Together with 1244573219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244573201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622286610 + 622286611.

It is an arithmetic number, because the mean of its divisors is an integer number (622286611).

Almost surely, 2^1244573221 is an apocalyptic number.

It is an amenable number.

1244573221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244573221 is an equidigital number, since it uses as much as digits as its factorization.

1244573221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 31.

The square root of 1244573221 is about 35278.5093364218. The cubic root of 1244573221 is about 1075.6561981742.

The spelling of 1244573221 in words is "one billion, two hundred forty-four million, five hundred seventy-three thousand, two hundred twenty-one".