8097991 has 4 divisors (see below), whose sum is σ = 8834184. Its totient is φ = 7361800.

The previous prime is 8097983. The next prime is 8098007. The reversal of 8097991 is 1997908.

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

It is a cyclic number.

It is not a de Polignac number, because 8097991 - 2³ = 8097983 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 (8097941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368080 + ... + 368101.

It is an arithmetic number, because the mean of its divisors is an integer number (2208546).

Almost surely, 2^8097991 is an apocalyptic number.

8097991 is a deficient number, since it is larger than the sum of its proper divisors (736193).

8097991 is a wasteful number, since it uses less digits than its factorization.

8097991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736192.

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

The square root of 8097991 is about 2845.6969269407. The cubic root of 8097991 is about 200.8132800617.

The spelling of 8097991 in words is "eight million, ninety-seven thousand, nine hundred ninety-one".