115651681 has 8 divisors (see below), whose sum is σ = 119831400. Its totient is φ = 111484800.

The previous prime is 115651667. The next prime is 115651709. The reversal of 115651681 is 186156511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70291456 + 45360225 = 8384^2 + 6735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115651681 - 2⁹ = 115651169 is a prime.

It is a super-2 number, since 2×115651681² = 26750622636251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115751681) 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 7 ways as a sum of consecutive naturals, for example, 17485 + ... + 23173.

It is an arithmetic number, because the mean of its divisors is an integer number (14978925).

Almost surely, 2^115651681 is an apocalyptic number.

It is an amenable number.

115651681 is a deficient number, since it is larger than the sum of its proper divisors (4179719).

115651681 is an equidigital number, since it uses as much as digits as its factorization.

115651681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419.

The product of its digits is 7200, while the sum is 34.

The square root of 115651681 is about 10754.1471535403. The cubic root of 115651681 is about 487.2112597419.

The spelling of 115651681 in words is "one hundred fifteen million, six hundred fifty-one thousand, six hundred eighty-one".