1297779073 has 2 divisors, whose sum is σ = 1297779074. Its totient is φ = 1297779072.

The previous prime is 1297779047. The next prime is 1297779089. The reversal of 1297779073 is 3709777921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 759167809 + 538611264 = 27553^2 + 23208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297779073 - 2⁹ = 1297778561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297779073.

It is not a weakly prime, because it can be changed into another prime (1297773073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648889536 + 648889537.

It is an arithmetic number, because the mean of its divisors is an integer number (648889537).

Almost surely, 2^1297779073 is an apocalyptic number.

It is an amenable number.

1297779073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297779073 is an equidigital number, since it uses as much as digits as its factorization.

1297779073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166886, while the sum is 52.

The square root of 1297779073 is about 36024.7008731509. The cubic root of 1297779073 is about 1090.7710149662.

The spelling of 1297779073 in words is "one billion, two hundred ninety-seven million, seven hundred seventy-nine thousand, seventy-three".