115918681 has 2 divisors, whose sum is σ = 115918682. Its totient is φ = 115918680.

The previous prime is 115918679. The next prime is 115918687. The reversal of 115918681 is 186819511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108493056 + 7425625 = 10416^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 115918681 - 2¹ = 115918679 is a prime.

It is a super-2 number, since 2×115918681² = 26874281209559522, which contains 22 as substring.

Together with 115918679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115918687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57959340 + 57959341.

It is an arithmetic number, because the mean of its divisors is an integer number (57959341).

Almost surely, 2^115918681 is an apocalyptic number.

It is an amenable number.

115918681 is a deficient number, since it is larger than the sum of its proper divisors (1).

115918681 is an equidigital number, since it uses as much as digits as its factorization.

115918681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 40.

The square root of 115918681 is about 10766.5538126180. The cubic root of 115918681 is about 487.5859060532.

The spelling of 115918681 in words is "one hundred fifteen million, nine hundred eighteen thousand, six hundred eighty-one".