1111181 has 2 divisors, whose sum is σ = 1111182. Its totient is φ = 1111180.

The previous prime is 1111169. The next prime is 1111183. The reversal of 1111181 is 1811111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 42025 = 1034^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111181 is a prime.

It is a super-2 number, since 2×1111181² = 2469446429522, which contains 22 as substring.

Together with 1111183, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555590 + 555591.

It is an arithmetic number, because the mean of its divisors is an integer number (555591).

2^1111181 is an apocalyptic number.

It is an amenable number.

1111181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111181 is an equidigital number, since it uses as much as digits as its factorization.

1111181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8, while the sum is 14.

The square root of 1111181 is about 1054.1257040790. The cubic root of 1111181 is about 103.5765884299.

Adding to 1111181 its reverse (1811111), we get a palindrome (2922292).

The spelling of 1111181 in words is "one million, one hundred eleven thousand, one hundred eighty-one".