1296111409 has 2 divisors, whose sum is σ = 1296111410. Its totient is φ = 1296111408.

The previous prime is 1296111373. The next prime is 1296111419. The reversal of 1296111409 is 9041116921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980942400 + 315169009 = 31320^2 + 17753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1296111409 - 2⁷ = 1296111281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1296111419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648055704 + 648055705.

It is an arithmetic number, because the mean of its divisors is an integer number (648055705).

Almost surely, 2^1296111409 is an apocalyptic number.

It is an amenable number.

1296111409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1296111409 is an equidigital number, since it uses as much as digits as its factorization.

1296111409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1296111409 is about 36001.5473139697. The cubic root of 1296111409 is about 1090.3035960986.

The spelling of 1296111409 in words is "one billion, two hundred ninety-six million, one hundred eleven thousand, four hundred nine".