116991291 has 8 divisors (see below), whose sum is σ = 156670480. Its totient is φ = 77653152.

The previous prime is 116991247. The next prime is 116991311. The reversal of 116991291 is 192199611.

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

It is not a de Polignac number, because 116991291 - 2⁹ = 116990779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116941291) 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, 84460 + ... + 85833.

It is an arithmetic number, because the mean of its divisors is an integer number (19583810).

Almost surely, 2^116991291 is an apocalyptic number.

116991291 is a deficient number, since it is larger than the sum of its proper divisors (39679189).

116991291 is a wasteful number, since it uses less digits than its factorization.

116991291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170525.

The product of its digits is 8748, while the sum is 39.

The square root of 116991291 is about 10816.2512452328. The cubic root of 116991291 is about 489.0851888837.

The spelling of 116991291 in words is "one hundred sixteen million, nine hundred ninety-one thousand, two hundred ninety-one".