1288207649 has 2 divisors, whose sum is σ = 1288207650. Its totient is φ = 1288207648.

The previous prime is 1288207607. The next prime is 1288207721. The reversal of 1288207649 is 9467028821.

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., 808378624 + 479829025 = 28432^2 + 21905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288207649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1288200649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644103824 + 644103825.

It is an arithmetic number, because the mean of its divisors is an integer number (644103825).

Almost surely, 2^1288207649 is an apocalyptic number.

It is an amenable number.

1288207649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288207649 is an equidigital number, since it uses as much as digits as its factorization.

1288207649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1288207649 is about 35891.6097298519. The cubic root of 1288207649 is about 1088.0828317060.

The spelling of 1288207649 in words is "one billion, two hundred eighty-eight million, two hundred seven thousand, six hundred forty-nine".