1297213289 has 2 divisors, whose sum is σ = 1297213290. Its totient is φ = 1297213288.

The previous prime is 1297213261. The next prime is 1297213343. The reversal of 1297213289 is 9823127921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290030889 + 7182400 = 35917^2 + 2680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1297213289 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 (1297213249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648606644 + 648606645.

It is an arithmetic number, because the mean of its divisors is an integer number (648606645).

Almost surely, 2^1297213289 is an apocalyptic number.

It is an amenable number.

1297213289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297213289 is an equidigital number, since it uses as much as digits as its factorization.

1297213289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 1297213289 is about 36016.8472940095. The cubic root of 1297213289 is about 1090.6124798950.

The spelling of 1297213289 in words is "one billion, two hundred ninety-seven million, two hundred thirteen thousand, two hundred eighty-nine".