1181181 has 4 divisors (see below), whose sum is σ = 1574912. Its totient is φ = 787452.

The previous prime is 1181171. The next prime is 1181183. The reversal of 1181181 is 1811811.

It is a happy 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 an emirpimes, since its reverse is a distinct semiprime: 1811811 = 3 ⋅603937.

It is not a de Polignac number, because 1181181 - 2⁵ = 1181149 is a prime.

It is a super-2 number, since 2×1181181² = 2790377109522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196861 + ... + 196866.

It is an arithmetic number, because the mean of its divisors is an integer number (393728).

2^1181181 is an apocalyptic number.

It is an amenable number.

1181181 is a deficient number, since it is larger than the sum of its proper divisors (393731).

1181181 is an equidigital number, since it uses as much as digits as its factorization.

1181181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393730.

The product of its digits is 64, while the sum is 21.

The square root of 1181181 is about 1086.8215124849. The cubic root of 1181181 is about 105.7074226822.

Adding to 1181181 its reverse (1811811), we get a palindrome (2992992).

The spelling of 1181181 in words is "one million, one hundred eighty-one thousand, one hundred eighty-one".