1291161319897 has 2 divisors, whose sum is σ = 1291161319898. Its totient is φ = 1291161319896.

The previous prime is 1291161319859. The next prime is 1291161319933. The reversal of 1291161319897 is 7989131611921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 738601017561 + 552560302336 = 859419^2 + 743344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291161319897 - 2⁷ = 1291161319769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291161319997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645580659948 + 645580659949.

It is an arithmetic number, because the mean of its divisors is an integer number (645580659949).

Almost surely, 2^{1291161319897} is an apocalyptic number.

It is an amenable number.

1291161319897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291161319897 is an equidigital number, since it uses as much as digits as its factorization.

1291161319897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 58.

The spelling of 1291161319897 in words is "one trillion, two hundred ninety-one billion, one hundred sixty-one million, three hundred nineteen thousand, eight hundred ninety-seven".