1115343181 has 2 divisors, whose sum is σ = 1115343182. Its totient is φ = 1115343180.

The previous prime is 1115343179. The next prime is 1115343193. The reversal of 1115343181 is 1813435111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733922281 + 381420900 = 27091^2 + 19530^2 .

It is an emirp because it is prime and its reverse (1813435111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1115343181 - 2¹ = 1115343179 is a prime.

It is a super-2 number, since 2×1115343181² = 2487980822806397522, which contains 22 as substring.

Together with 1115343179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1115343121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557671590 + 557671591.

It is an arithmetic number, because the mean of its divisors is an integer number (557671591).

Almost surely, 2^1115343181 is an apocalyptic number.

It is an amenable number.

1115343181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115343181 is an equidigital number, since it uses as much as digits as its factorization.

1115343181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 1115343181 is about 33396.7540488593. The cubic root of 1115343181 is about 1037.0575051330.

Adding to 1115343181 its reverse (1813435111), we get a palindrome (2928778292).

The spelling of 1115343181 in words is "one billion, one hundred fifteen million, three hundred forty-three thousand, one hundred eighty-one".