8560991 has 8 divisors (see below), whose sum is σ = 9222144. Its totient is φ = 7923960.

The previous prime is 8560961. The next prime is 8561011. The reversal of 8560991 is 1990658.

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

It is not a de Polignac number, because 8560991 - 2¹⁸ = 8298847 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 (8560961) 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 7 ways as a sum of consecutive naturals, for example, 5291 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (1152768).

Almost surely, 2^8560991 is an apocalyptic number.

8560991 is a deficient number, since it is larger than the sum of its proper divisors (661153).

8560991 is a wasteful number, since it uses less digits than its factorization.

8560991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12061.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 8560991 is about 2925.9171211776. The cubic root of 8560991 is about 204.5697181602.

The spelling of 8560991 in words is "eight million, five hundred sixty thousand, nine hundred ninety-one".