1191005534197 has 2 divisors, whose sum is σ = 1191005534198. Its totient is φ = 1191005534196.

The previous prime is 1191005534171. The next prime is 1191005534233. The reversal of 1191005534197 is 7914355001911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189552323556 + 1453210641 = 1090666^2 + 38121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191005534197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191005534137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595502767098 + 595502767099.

It is an arithmetic number, because the mean of its divisors is an integer number (595502767099).

Almost surely, 2^{1191005534197} is an apocalyptic number.

It is an amenable number.

1191005534197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191005534197 is an equidigital number, since it uses as much as digits as its factorization.

1191005534197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 46.

The spelling of 1191005534197 in words is "one trillion, one hundred ninety-one billion, five million, five hundred thirty-four thousand, one hundred ninety-seven".