8911609 has 4 divisors (see below), whose sum is σ = 10184704. Its totient is φ = 7638516.

The previous prime is 8911607. The next prime is 8911619. The reversal of 8911609 is 9061198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8911609 - 2¹ = 8911607 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8911607) 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, 636537 + ... + 636550.

It is an arithmetic number, because the mean of its divisors is an integer number (2546176).

Almost surely, 2^8911609 is an apocalyptic number.

It is an amenable number.

8911609 is a deficient number, since it is larger than the sum of its proper divisors (1273095).

8911609 is a wasteful number, since it uses less digits than its factorization.

8911609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273094.

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

The square root of 8911609 is about 2985.2318167941. The cubic root of 8911609 is about 207.3251752412.

It can be divided in two parts, 891 and 1609, that added together give a square (2500 = 50²).

The spelling of 8911609 in words is "eight million, nine hundred eleven thousand, six hundred nine".