1297579998779 has 2 divisors, whose sum is σ = 1297579998780. Its totient is φ = 1297579998778.

The previous prime is 1297579998739. The next prime is 1297579998787. The reversal of 1297579998779 is 9778999757921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1297579998779 - 2²⁰ = 1297578950203 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1297579998694 and 1297579998703.

It is not a weakly prime, because it can be changed into another prime (1297579998719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648789999389 + 648789999390.

It is an arithmetic number, because the mean of its divisors is an integer number (648789999390).

Almost surely, 2^{1297579998779} is an apocalyptic number.

1297579998779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297579998779 is an equidigital number, since it uses as much as digits as its factorization.

1297579998779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11342131920, while the sum is 89.

The spelling of 1297579998779 in words is "one trillion, two hundred ninety-seven billion, five hundred seventy-nine million, nine hundred ninety-eight thousand, seven hundred seventy-nine".