115890689 has 2 divisors, whose sum is σ = 115890690. Its totient is φ = 115890688.

The previous prime is 115890611. The next prime is 115890707. The reversal of 115890689 is 986098511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63473089 + 52417600 = 7967^2 + 7240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115890689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (115890589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57945344 + 57945345.

It is an arithmetic number, because the mean of its divisors is an integer number (57945345).

Almost surely, 2^115890689 is an apocalyptic number.

It is an amenable number.

115890689 is a deficient number, since it is larger than the sum of its proper divisors (1).

115890689 is an equidigital number, since it uses as much as digits as its factorization.

115890689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 115890689 is about 10765.2537824243. The cubic root of 115890689 is about 487.5466555391.

The spelling of 115890689 in words is "one hundred fifteen million, eight hundred ninety thousand, six hundred eighty-nine".