115811081 has 4 divisors (see below), whose sum is σ = 115952964. Its totient is φ = 115669200.

The previous prime is 115811063. The next prime is 115811093. The reversal of 115811081 is 180118511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67980025 + 47831056 = 8245^2 + 6916^2 .

It is a cyclic number.

It is not a de Polignac number, because 115811081 - 2¹⁴ = 115794697 is a prime.

It is a super-3 number, since 3×115811081³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 115811081.

It is not an unprimeable number, because it can be changed into a prime (115811051) 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 in 3 ways as a sum of consecutive naturals, for example, 69710 + ... + 71351.

It is an arithmetic number, because the mean of its divisors is an integer number (28988241).

Almost surely, 2^115811081 is an apocalyptic number.

It is an amenable number.

115811081 is a deficient number, since it is larger than the sum of its proper divisors (141883).

115811081 is an equidigital number, since it uses as much as digits as its factorization.

115811081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141882.

The product of its (nonzero) digits is 320, while the sum is 26.

The square root of 115811081 is about 10761.5556960878. Note that the first 3 decimals coincide. The cubic root of 115811081 is about 487.4349942689.

Adding to 115811081 its reverse (180118511), we get a palindrome (295929592).

The spelling of 115811081 in words is "one hundred fifteen million, eight hundred eleven thousand, eighty-one".