115853431681 has 4 divisors (see below), whose sum is σ = 124765234132. Its totient is φ = 106941629232.

The previous prime is 115853431637. The next prime is 115853431723. The reversal of 115853431681 is 186134358511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186134358511 = 6829 ⋅27256459.

It can be written as a sum of positive squares in 2 ways, for example, as 72356158081 + 43497273600 = 268991^2 + 208560^2 .

It is a cyclic number.

It is not a de Polignac number, because 115853431681 - 2¹⁹ = 115852907393 is a prime.

It is a super-2 number, since 2×115853431681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115853431181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4455901206 + ... + 4455901231.

It is an arithmetic number, because the mean of its divisors is an integer number (31191308533).

Almost surely, 2^115853431681 is an apocalyptic number.

It is an amenable number.

115853431681 is a deficient number, since it is larger than the sum of its proper divisors (8911802451).

115853431681 is an equidigital number, since it uses as much as digits as its factorization.

115853431681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8911802450.

The product of its digits is 345600, while the sum is 46.

The spelling of 115853431681 in words is "one hundred fifteen billion, eight hundred fifty-three million, four hundred thirty-one thousand, six hundred eighty-one".