1297999601 has 2 divisors, whose sum is σ = 1297999602. Its totient is φ = 1297999600.

The previous prime is 1297999597. The next prime is 1297999631. The reversal of 1297999601 is 1069997921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1285581025 + 12418576 = 35855^2 + 3524^2 .

It is an emirp because it is prime and its reverse (1069997921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1297999601 - 2² = 1297999597 is a prime.

It is not a weakly prime, because it can be changed into another prime (1297999631) 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 as a sum of consecutive naturals, namely, 648999800 + 648999801.

It is an arithmetic number, because the mean of its divisors is an integer number (648999801).

Almost surely, 2^1297999601 is an apocalyptic number.

It is an amenable number.

1297999601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297999601 is an equidigital number, since it uses as much as digits as its factorization.

1297999601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 53.

The square root of 1297999601 is about 36027.7615319076. The cubic root of 1297999601 is about 1090.8327953652.

The spelling of 1297999601 in words is "one billion, two hundred ninety-seven million, nine hundred ninety-nine thousand, six hundred one".