1297791457 has 2 divisors, whose sum is σ = 1297791458. Its totient is φ = 1297791456.

The previous prime is 1297791449. The next prime is 1297791511. The reversal of 1297791457 is 7541977921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948886416 + 348905041 = 30804^2 + 18679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297791457 - 2³ = 1297791449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1297191457) 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, 648895728 + 648895729.

It is an arithmetic number, because the mean of its divisors is an integer number (648895729).

Almost surely, 2^1297791457 is an apocalyptic number.

It is an amenable number.

1297791457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297791457 is an equidigital number, since it uses as much as digits as its factorization.

1297791457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1111320, while the sum is 52.

The square root of 1297791457 is about 36024.8727548065. The cubic root of 1297791457 is about 1090.7744845001.

The spelling of 1297791457 in words is "one billion, two hundred ninety-seven million, seven hundred ninety-one thousand, four hundred fifty-seven".