116188991 has 4 divisors (see below), whose sum is σ = 119329272. Its totient is φ = 113048712.

The previous prime is 116188987. The next prime is 116188997. The reversal of 116188991 is 199881611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 116188991 - 2² = 116188987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116188997) 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 in 3 ways as a sum of consecutive naturals, for example, 1570085 + ... + 1570158.

It is an arithmetic number, because the mean of its divisors is an integer number (29832318).

Almost surely, 2^116188991 is an apocalyptic number.

116188991 is a deficient number, since it is larger than the sum of its proper divisors (3140281).

116188991 is an equidigital number, since it uses as much as digits as its factorization.

116188991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140280.

The product of its digits is 31104, while the sum is 44.

The square root of 116188991 is about 10779.0997304970. The cubic root of 116188991 is about 487.9646112808.

The spelling of 116188991 in words is "one hundred sixteen million, one hundred eighty-eight thousand, nine hundred ninety-one".