115597681 has 2 divisors, whose sum is σ = 115597682. Its totient is φ = 115597680.

The previous prime is 115597679. The next prime is 115597721. The reversal of 115597681 is 186795511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 54523456 = 7815^2 + 7384^2 .

It is a cyclic number.

It is not a de Polignac number, because 115597681 - 2¹ = 115597679 is a prime.

It is a super-2 number, since 2×115597681² = 26725647705155522, which contains 22 as substring.

Together with 115597679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (115597381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57798840 + 57798841.

It is an arithmetic number, because the mean of its divisors is an integer number (57798841).

Almost surely, 2^115597681 is an apocalyptic number.

It is an amenable number.

115597681 is a deficient number, since it is larger than the sum of its proper divisors (1).

115597681 is an equidigital number, since it uses as much as digits as its factorization.

115597681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 43.

The square root of 115597681 is about 10751.6362010626. The cubic root of 115597681 is about 487.1354184927.

The spelling of 115597681 in words is "one hundred fifteen million, five hundred ninety-seven thousand, six hundred eighty-one".