11491189 has 4 divisors (see below), whose sum is σ = 11579040. Its totient is φ = 11403340.

The previous prime is 11491187. The next prime is 11491199. The reversal of 11491189 is 98119411.

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: 98119411 = 13 ⋅7547647.

It is a cyclic number.

It is not a de Polignac number, because 11491189 - 2¹ = 11491187 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 (11491187) 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, 43729 + ... + 43990.

It is an arithmetic number, because the mean of its divisors is an integer number (2894760).

Almost surely, 2^11491189 is an apocalyptic number.

It is an amenable number.

11491189 is a deficient number, since it is larger than the sum of its proper divisors (87851).

11491189 is an equidigital number, since it uses as much as digits as its factorization.

11491189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87850.

The product of its digits is 2592, while the sum is 34.

The square root of 11491189 is about 3389.8656315553. The cubic root of 11491189 is about 225.6602106634.

The spelling of 11491189 in words is "eleven million, four hundred ninety-one thousand, one hundred eighty-nine".