9078991 has 4 divisors (see below), whose sum is σ = 9168984. Its totient is φ = 8989000.

The previous prime is 9078973. The next prime is 9079013. The reversal of 9078991 is 1998709.

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

It is not a de Polignac number, because 9078991 - 2⁷ = 9078863 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 (9078931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44845 + ... + 45046.

It is an arithmetic number, because the mean of its divisors is an integer number (2292246).

Almost surely, 2^9078991 is an apocalyptic number.

9078991 is a deficient number, since it is larger than the sum of its proper divisors (89993).

9078991 is a wasteful number, since it uses less digits than its factorization.

9078991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89992.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9078991 is about 3013.1364058071. The cubic root of 9078991 is about 208.6151583553.

The spelling of 9078991 in words is "nine million, seventy-eight thousand, nine hundred ninety-one".