1296220609 has 2 divisors, whose sum is σ = 1296220610. Its totient is φ = 1296220608.

The previous prime is 1296220559. The next prime is 1296220657. The reversal of 1296220609 is 9060226921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1232220609 + 64000000 = 35103^2 + 8000^2 .

It is an emirp because it is prime and its reverse (9060226921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1296220609 - 2⁷ = 1296220481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1296220309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648110304 + 648110305.

It is an arithmetic number, because the mean of its divisors is an integer number (648110305).

Almost surely, 2^1296220609 is an apocalyptic number.

It is an amenable number.

1296220609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296220609 is an equidigital number, since it uses as much as digits as its factorization.

1296220609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1296220609 is about 36003.0638835086. The cubic root of 1296220609 is about 1090.3342153309.

The spelling of 1296220609 in words is "one billion, two hundred ninety-six million, two hundred twenty thousand, six hundred nine".