11911089 has 4 divisors (see below), whose sum is σ = 15881456. Its totient is φ = 7940724.

The previous prime is 11911063. The next prime is 11911093. The reversal of 11911089 is 98011911.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98011911 = 3 ⋅32670637.

It is not a de Polignac number, because 11911089 - 2⁵ = 11911057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11911019) 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, 1985179 + ... + 1985184.

It is an arithmetic number, because the mean of its divisors is an integer number (3970364).

Almost surely, 2^11911089 is an apocalyptic number.

It is an amenable number.

11911089 is a deficient number, since it is larger than the sum of its proper divisors (3970367).

11911089 is an equidigital number, since it uses as much as digits as its factorization.

11911089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970366.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 11911089 is about 3451.2445581268. The cubic root of 11911089 is about 228.3760146591.

The spelling of 11911089 in words is "eleven million, nine hundred eleven thousand, eighty-nine".