8991601 has 8 divisors (see below), whose sum is σ = 9341024. Its totient is φ = 8648640.

The previous prime is 8991599. The next prime is 8991607. The reversal of 8991601 is 1061998.

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

It is a cyclic number.

It is not a de Polignac number, because 8991601 - 2¹ = 8991599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991607) 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, 1321 + ... + 4441.

It is an arithmetic number, because the mean of its divisors is an integer number (1167628).

Almost surely, 2^8991601 is an apocalyptic number.

It is an amenable number.

8991601 is a deficient number, since it is larger than the sum of its proper divisors (349423).

8991601 is a wasteful number, since it uses less digits than its factorization.

8991601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 8991601 is about 2998.5998399253. The cubic root of 8991601 is about 207.9436561515.

It can be divided in two parts, 899 and 1601, that added together give a square (2500 = 50²).

The spelling of 8991601 in words is "eight million, nine hundred ninety-one thousand, six hundred one".