1222289561789 has 8 divisors (see below), whose sum is σ = 1223817630840. Its totient is φ = 1220762388736.

The previous prime is 1222289561737. The next prime is 1222289561827. The reversal of 1222289561789 is 9871659822221.

It can be written as a sum of positive squares in 4 ways, for example, as 125221853689 + 1097067708100 = 353867^2 + 1047410^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222289561789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222289569789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527097 + ... + 2971665.

It is an arithmetic number, because the mean of its divisors is an integer number (152977203855).

Almost surely, 2^{1222289561789} is an apocalyptic number.

It is an amenable number.

1222289561789 is a deficient number, since it is larger than the sum of its proper divisors (1528069051).

1222289561789 is a wasteful number, since it uses less digits than its factorization.

1222289561789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447999.

The product of its digits is 17418240, while the sum is 62.

The spelling of 1222289561789 in words is "one trillion, two hundred twenty-two billion, two hundred eighty-nine million, five hundred sixty-one thousand, seven hundred eighty-nine".