9391166987 has 4 divisors (see below), whose sum is σ = 9391961136. Its totient is φ = 9390372840.

The previous prime is 9391166929. The next prime is 9391166989. The reversal of 9391166987 is 7896611939.

9391166987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7896611939 = 1103 ⋅7159213.

It is a cyclic number.

It is not a de Polignac number, because 9391166987 - 2¹⁶ = 9391101451 is a prime.

It is a super-3 number, since 3×9391166987³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9391166989) 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, 379064 + ... + 403077.

It is an arithmetic number, because the mean of its divisors is an integer number (2347990284).

Almost surely, 2^9391166987 is an apocalyptic number.

9391166987 is a deficient number, since it is larger than the sum of its proper divisors (794149).

9391166987 is a wasteful number, since it uses less digits than its factorization.

9391166987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794148.

The product of its digits is 4408992, while the sum is 59.

The square root of 9391166987 is about 96908.0336556263. The cubic root of 9391166987 is about 2109.7930351869.

The spelling of 9391166987 in words is "nine billion, three hundred ninety-one million, one hundred sixty-six thousand, nine hundred eighty-seven".