1131181 has 2 divisors, whose sum is σ = 1131182. Its totient is φ = 1131180.

The previous prime is 1131157. The next prime is 1131191. The reversal of 1131181 is 1811311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 933156 + 198025 = 966^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131181 - 2¹¹ = 1129133 is a prime.

It is a super-2 number, since 2×1131181² = 2559140909522, which contains 22 as substring.

1131181 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565590 + 565591.

It is an arithmetic number, because the mean of its divisors is an integer number (565591).

2^1131181 is an apocalyptic number.

It is an amenable number.

1131181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131181 is an equidigital number, since it uses as much as digits as its factorization.

1131181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 16.

The square root of 1131181 is about 1063.5699318804. The cubic root of 1131181 is about 104.1943174240.

Adding to 1131181 its reverse (1811311), we get a palindrome (2942492).

The spelling of 1131181 in words is "one million, one hundred thirty-one thousand, one hundred eighty-one".