116987991 has 8 divisors (see below), whose sum is σ = 156048000. Its totient is φ = 77959992.

The previous prime is 116987989. The next prime is 116988007. The reversal of 116987991 is 199789611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 116987991 - 2¹ = 116987989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116987911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2496 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (19506000).

Almost surely, 2^116987991 is an apocalyptic number.

116987991 is a deficient number, since it is larger than the sum of its proper divisors (39060009).

116987991 is a wasteful number, since it uses less digits than its factorization.

116987991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16005.

The product of its digits is 244944, while the sum is 51.

The square root of 116987991 is about 10816.0986959254. The cubic root of 116987991 is about 489.0805902613.

The spelling of 116987991 in words is "one hundred sixteen million, nine hundred eighty-seven thousand, nine hundred ninety-one".