11161181 has 2 divisors, whose sum is σ = 11161182. Its totient is φ = 11161180.

The previous prime is 11161177. The next prime is 11161219. The reversal of 11161181 is 18116111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7513081 + 3648100 = 2741^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 11161181 - 2² = 11161177 is a prime.

It is a super-2 number, since 2×11161181² = 249143922629522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11161081) 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 as a sum of consecutive naturals, namely, 5580590 + 5580591.

It is an arithmetic number, because the mean of its divisors is an integer number (5580591).

Almost surely, 2^11161181 is an apocalyptic number.

It is an amenable number.

11161181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11161181 is an equidigital number, since it uses as much as digits as its factorization.

11161181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 20.

The square root of 11161181 is about 3340.8353745733. The cubic root of 11161181 is about 223.4789988058.

Adding to 11161181 its reverse (18116111), we get a palindrome (29277292).

The spelling of 11161181 in words is "eleven million, one hundred sixty-one thousand, one hundred eighty-one".