1291161319949 has 2 divisors, whose sum is σ = 1291161319950. Its totient is φ = 1291161319948.

The previous prime is 1291161319933. The next prime is 1291161319969. The reversal of 1291161319949 is 9499131611921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053425113225 + 237736206724 = 1026365^2 + 487582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291161319949 - 2⁴ = 1291161319933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291161319894 and 1291161319903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291161319969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645580659974 + 645580659975.

It is an arithmetic number, because the mean of its divisors is an integer number (645580659975).

Almost surely, 2^{1291161319949} is an apocalyptic number.

It is an amenable number.

1291161319949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291161319949 is an equidigital number, since it uses as much as digits as its factorization.

1291161319949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 56.

The spelling of 1291161319949 in words is "one trillion, two hundred ninety-one billion, one hundred sixty-one million, three hundred nineteen thousand, nine hundred forty-nine".