1297681291 has 2 divisors, whose sum is σ = 1297681292. Its totient is φ = 1297681290.

The previous prime is 1297681289. The next prime is 1297681373. The reversal of 1297681291 is 1921867921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1297681291 - 2¹ = 1297681289 is a prime.

It is a super-2 number, since 2×1297681291² = 3367953466022853362, which contains 22 as substring.

Together with 1297681289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1297681211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648840645 + 648840646.

It is an arithmetic number, because the mean of its divisors is an integer number (648840646).

Almost surely, 2^1297681291 is an apocalyptic number.

1297681291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297681291 is an equidigital number, since it uses as much as digits as its factorization.

1297681291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 1297681291 is about 36023.3436954428. The cubic root of 1297681291 is about 1090.7436193300.

The spelling of 1297681291 in words is "one billion, two hundred ninety-seven million, six hundred eighty-one thousand, two hundred ninety-one".