115991787 has 8 divisors (see below), whose sum is σ = 154921536. Its totient is φ = 77194952.

The previous prime is 115991773. The next prime is 115991803. The reversal of 115991787 is 787199511.

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 115991787 - 2¹¹ = 115989739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115991717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31173 + ... + 34694.

It is an arithmetic number, because the mean of its divisors is an integer number (19365192).

Almost surely, 2^115991787 is an apocalyptic number.

115991787 is a deficient number, since it is larger than the sum of its proper divisors (38929749).

115991787 is an equidigital number, since it uses as much as digits as its factorization.

115991787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66457.

The product of its digits is 158760, while the sum is 48.

The square root of 115991787 is about 10769.9483285669. The cubic root of 115991787 is about 487.6883858378.

The spelling of 115991787 in words is "one hundred fifteen million, nine hundred ninety-one thousand, seven hundred eighty-seven".