11161608191 has 4 divisors (see below), whose sum is σ = 11179297584. Its totient is φ = 11143918800.

The previous prime is 11161608173. The next prime is 11161608203. The reversal of 11161608191 is 19180616111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11161608191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11161608151) 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, 8843750 + ... + 8845011.

It is an arithmetic number, because the mean of its divisors is an integer number (2794824396).

Almost surely, 2^11161608191 is an apocalyptic number.

11161608191 is a deficient number, since it is larger than the sum of its proper divisors (17689393).

11161608191 is an equidigital number, since it uses as much as digits as its factorization.

11161608191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17689392.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 11161608191 in words is "eleven billion, one hundred sixty-one million, six hundred eight thousand, one hundred ninety-one".