116668991 has 4 divisors (see below), whose sum is σ = 116783184. Its totient is φ = 116554800.

The previous prime is 116668973. The next prime is 116669009. The reversal of 116668991 is 199866611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199866611 = 7 ⋅28552373.

It is an interprime number because it is at equal distance from previous prime (116668973) and next prime (116669009).

It is a cyclic number.

It is not a de Polignac number, because 116668991 - 2⁶ = 116668927 is a prime.

It is a super-2 number, since 2×116668991² = 27223306921916162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116668921) 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 3 ways as a sum of consecutive naturals, for example, 55550 + ... + 57611.

It is an arithmetic number, because the mean of its divisors is an integer number (29195796).

Almost surely, 2^116668991 is an apocalyptic number.

116668991 is a deficient number, since it is larger than the sum of its proper divisors (114193).

116668991 is a wasteful number, since it uses less digits than its factorization.

116668991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114192.

The product of its digits is 139968, while the sum is 47.

The square root of 116668991 is about 10801.3420925365. The cubic root of 116668991 is about 488.6356479224.

The spelling of 116668991 in words is "one hundred sixteen million, six hundred sixty-eight thousand, nine hundred ninety-one".