91176251161 has 4 divisors (see below), whose sum is σ = 91184852772. Its totient is φ = 91167649552.

The previous prime is 91176251129. The next prime is 91176251207. The reversal of 91176251161 is 16115267119.

It is a happy number.

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 55104745536 + 36071505625 = 234744^2 + 189925^2 .

It is a cyclic number.

It is not a de Polignac number, because 91176251161 - 2⁵ = 91176251129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91176252161) 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, 4284886 + ... + 4306111.

It is an arithmetic number, because the mean of its divisors is an integer number (22796213193).

Almost surely, 2^91176251161 is an apocalyptic number.

It is an amenable number.

91176251161 is a deficient number, since it is larger than the sum of its proper divisors (8601611).

91176251161 is a wasteful number, since it uses less digits than its factorization.

91176251161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8601610.

The product of its digits is 22680, while the sum is 40.

The spelling of 91176251161 in words is "ninety-one billion, one hundred seventy-six million, two hundred fifty-one thousand, one hundred sixty-one".