9891611 has 4 divisors (see below), whose sum is σ = 9936192. Its totient is φ = 9847032.

The previous prime is 9891601. The next prime is 9891613. The reversal of 9891611 is 1161989.

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 9891611 - 2¹⁴ = 9875227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9891613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21956 + ... + 22401.

It is an arithmetic number, because the mean of its divisors is an integer number (2484048).

Almost surely, 2^9891611 is an apocalyptic number.

9891611 is a deficient number, since it is larger than the sum of its proper divisors (44581).

9891611 is a wasteful number, since it uses less digits than its factorization.

9891611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44580.

The product of its digits is 3888, while the sum is 35.

The square root of 9891611 is about 3145.0931623721. The cubic root of 9891611 is about 214.6622495758.

The spelling of 9891611 in words is "nine million, eight hundred ninety-one thousand, six hundred eleven".