11891289 has 4 divisors (see below), whose sum is σ = 15855056. Its totient is φ = 7927524.

The previous prime is 11891287. The next prime is 11891291. The reversal of 11891289 is 98219811.

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 an interprime number because it is at equal distance from previous prime (11891287) and next prime (11891291).

It is not a de Polignac number, because 11891289 - 2¹ = 11891287 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11891287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981879 + ... + 1981884.

It is an arithmetic number, because the mean of its divisors is an integer number (3963764).

Almost surely, 2^11891289 is an apocalyptic number.

It is an amenable number.

11891289 is a deficient number, since it is larger than the sum of its proper divisors (3963767).

11891289 is an equidigital number, since it uses as much as digits as its factorization.

11891289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963766.

The product of its digits is 10368, while the sum is 39.

The square root of 11891289 is about 3448.3748346141. The cubic root of 11891289 is about 228.2494000681.

The spelling of 11891289 in words is "eleven million, eight hundred ninety-one thousand, two hundred eighty-nine".