1222447789 has 2 divisors, whose sum is σ = 1222447790. Its totient is φ = 1222447788.

The previous prime is 1222447777. The next prime is 1222447879. The reversal of 1222447789 is 9877442221.

Together with next prime (1222447879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753941764 + 468506025 = 27458^2 + 21645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222447789 - 2⁷ = 1222447661 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222447739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611223894 + 611223895.

It is an arithmetic number, because the mean of its divisors is an integer number (611223895).

Almost surely, 2^1222447789 is an apocalyptic number.

It is an amenable number.

1222447789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222447789 is an equidigital number, since it uses as much as digits as its factorization.

1222447789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 46.

The square root of 1222447789 is about 34963.5208324333. The cubic root of 1222447789 is about 1069.2438798785.

It can be divided in two parts, 1222447 and 789, that added together give a square (1223236 = 1106²).

The spelling of 1222447789 in words is "one billion, two hundred twenty-two million, four hundred forty-seven thousand, seven hundred eighty-nine".