11155161971 has 2 divisors, whose sum is σ = 11155161972. Its totient is φ = 11155161970.

The previous prime is 11155161917. The next prime is 11155161977. The reversal of 11155161971 is 17916155111.

11155161971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (11155161917) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (17916155111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11155161971 - 2⁶ = 11155161907 is a prime.

It is not a weakly prime, because it can be changed into another prime (11155161977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577580985 + 5577580986.

It is an arithmetic number, because the mean of its divisors is an integer number (5577580986).

Almost surely, 2^11155161971 is an apocalyptic number.

11155161971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155161971 is an equidigital number, since it uses as much as digits as its factorization.

11155161971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 38.

The spelling of 11155161971 in words is "eleven billion, one hundred fifty-five million, one hundred sixty-one thousand, nine hundred seventy-one".