1297456309 has 2 divisors, whose sum is σ = 1297456310. Its totient is φ = 1297456308.

The previous prime is 1297456301. The next prime is 1297456313. The reversal of 1297456309 is 9036547921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1083858084 + 213598225 = 32922^2 + 14615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297456309 - 2³ = 1297456301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297456301) 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, 648728154 + 648728155.

It is an arithmetic number, because the mean of its divisors is an integer number (648728155).

Almost surely, 2^1297456309 is an apocalyptic number.

It is an amenable number.

1297456309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297456309 is an equidigital number, since it uses as much as digits as its factorization.

1297456309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 1297456309 is about 36020.2208349699. The cubic root of 1297456309 is about 1090.6805807740.

The spelling of 1297456309 in words is "one billion, two hundred ninety-seven million, four hundred fifty-six thousand, three hundred nine".