11171161 has 4 divisors (see below), whose sum is σ = 11178000. Its totient is φ = 11164324.

The previous prime is 11171137. The next prime is 11171179. The reversal of 11171161 is 16117111.

It is a happy number.

11171161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is the 1365-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16117111 = 19 ⋅848269.

It is a cyclic number.

It is not a de Polignac number, because 11171161 - 2¹³ = 11162969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11171761) 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 3 ways as a sum of consecutive naturals, for example, 630 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (2794500).

Almost surely, 2^11171161 is an apocalyptic number.

It is an amenable number.

11171161 is a deficient number, since it is larger than the sum of its proper divisors (6839).

11171161 is an equidigital number, since it uses as much as digits as its factorization.

11171161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838.

The product of its digits is 42, while the sum is 19.

The square root of 11171161 is about 3342.3286792295. The cubic root of 11171161 is about 223.5455884130.

Adding to 11171161 its reverse (16117111), we get a palindrome (27288272).

It can be divided in two parts, 1117 and 1161, that added together give a triangular number (2278 = T₆₇).

The spelling of 11171161 in words is "eleven million, one hundred seventy-one thousand, one hundred sixty-one".