115131689 has 2 divisors, whose sum is σ = 115131690. Its totient is φ = 115131688.

The previous prime is 115131671. The next prime is 115131691. The reversal of 115131689 is 986131511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112190464 + 2941225 = 10592^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 115131689 - 2⁸ = 115131433 is a prime.

It is a Sophie Germain prime.

Together with 115131691, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (115131389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57565844 + 57565845.

It is an arithmetic number, because the mean of its divisors is an integer number (57565845).

Almost surely, 2^115131689 is an apocalyptic number.

It is an amenable number.

115131689 is a deficient number, since it is larger than the sum of its proper divisors (1).

115131689 is an equidigital number, since it uses as much as digits as its factorization.

115131689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 35.

The square root of 115131689 is about 10729.9435692831. The cubic root of 115131689 is about 486.4799644025.

The spelling of 115131689 in words is "one hundred fifteen million, one hundred thirty-one thousand, six hundred eighty-nine".