115989311 has 2 divisors, whose sum is σ = 115989312. Its totient is φ = 115989310.

The previous prime is 115989239. The next prime is 115989323. The reversal of 115989311 is 113989511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115989311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115989331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57994655 + 57994656.

It is an arithmetic number, because the mean of its divisors is an integer number (57994656).

Almost surely, 2^115989311 is an apocalyptic number.

115989311 is a deficient number, since it is larger than the sum of its proper divisors (1).

115989311 is an equidigital number, since it uses as much as digits as its factorization.

115989311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 38.

The square root of 115989311 is about 10769.8333784697. The cubic root of 115989311 is about 487.6849156926.

The spelling of 115989311 in words is "one hundred fifteen million, nine hundred eighty-nine thousand, three hundred eleven".