1191191282789 has 2 divisors, whose sum is σ = 1191191282790. Its totient is φ = 1191191282788.

The previous prime is 1191191282783. The next prime is 1191191282821. The reversal of 1191191282789 is 9872821911911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017744021889 + 173447260900 = 1008833^2 + 416470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191191282789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191191282783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595595641394 + 595595641395.

It is an arithmetic number, because the mean of its divisors is an integer number (595595641395).

Almost surely, 2^{1191191282789} is an apocalyptic number.

It is an amenable number.

1191191282789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191191282789 is an equidigital number, since it uses as much as digits as its factorization.

1191191282789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 59.

The spelling of 1191191282789 in words is "one trillion, one hundred ninety-one billion, one hundred ninety-one million, two hundred eighty-two thousand, seven hundred eighty-nine".