1290001663 has 2 divisors, whose sum is σ = 1290001664. Its totient is φ = 1290001662.

The previous prime is 1290001649. The next prime is 1290001679. The reversal of 1290001663 is 3661000921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1290001663 - 2¹⁷ = 1289870591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290001613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645000831 + 645000832.

It is an arithmetic number, because the mean of its divisors is an integer number (645000832).

Almost surely, 2^1290001663 is an apocalyptic number.

1290001663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290001663 is an equidigital number, since it uses as much as digits as its factorization.

1290001663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1290001663 is about 35916.5931430029. The cubic root of 1290001663 is about 1088.5877012358.

The spelling of 1290001663 in words is "one billion, two hundred ninety million, one thousand, six hundred sixty-three".