11971161 has 6 divisors (see below), whose sum is σ = 17291690. Its totient is φ = 7980768.

The previous prime is 11971117. The next prime is 11971199. The reversal of 11971161 is 16117911.

It can be written as a sum of positive squares in only one way, i.e., 11943936 + 27225 = 3456^2 + 165^2 .

It is not a de Polignac number, because 11971161 - 2⁷ = 11971033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665056 + ... + 665073.

Almost surely, 2^11971161 is an apocalyptic number.

It is an amenable number.

11971161 is a deficient number, since it is larger than the sum of its proper divisors (5320529).

11971161 is a wasteful number, since it uses less digits than its factorization.

11971161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330135 (or 1330132 counting only the distinct ones).

The product of its digits is 378, while the sum is 27.

The square root of 11971161 is about 3459.9365601120. The cubic root of 11971161 is about 228.7592990934.

The spelling of 11971161 in words is "eleven million, nine hundred seventy-one thousand, one hundred sixty-one".