11159951161 has 4 divisors (see below), whose sum is σ = 11171662452. Its totient is φ = 11148239872.

The previous prime is 11159951123. The next prime is 11159951167. The reversal of 11159951161 is 16115995111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3944468025 + 7215483136 = 62805^2 + 84944^2 .

It is a cyclic number.

It is not a de Polignac number, because 11159951161 - 2⁹ = 11159950649 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11159951167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5854216 + ... + 5856121.

It is an arithmetic number, because the mean of its divisors is an integer number (2792915613).

Almost surely, 2^11159951161 is an apocalyptic number.

It is an amenable number.

11159951161 is a deficient number, since it is larger than the sum of its proper divisors (11711291).

11159951161 is an equidigital number, since it uses as much as digits as its factorization.

11159951161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11711290.

The product of its digits is 12150, while the sum is 40.

The spelling of 11159951161 in words is "eleven billion, one hundred fifty-nine million, nine hundred fifty-one thousand, one hundred sixty-one".