1191148071161 has 4 divisors (see below), whose sum is σ = 1191437821824. Its totient is φ = 1190858320500.

The previous prime is 1191148071143. The next prime is 1191148071163. The reversal of 1191148071161 is 1611708411911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1191148071161 - 2¹⁰ = 1191148070137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1191148071163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144869165 + ... + 144877386.

It is an arithmetic number, because the mean of its divisors is an integer number (297859455456).

Almost surely, 2^{1191148071161} is an apocalyptic number.

It is an amenable number.

1191148071161 is a deficient number, since it is larger than the sum of its proper divisors (289750663).

1191148071161 is an equidigital number, since it uses as much as digits as its factorization.

1191148071161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289750662.

The product of its (nonzero) digits is 12096, while the sum is 41.

The spelling of 1191148071161 in words is "one trillion, one hundred ninety-one billion, one hundred forty-eight million, seventy-one thousand, one hundred sixty-one".