11471891 has 4 divisors (see below), whose sum is σ = 11841984. Its totient is φ = 11101800.

The previous prime is 11471861. The next prime is 11471893. The reversal of 11471891 is 19817411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11471891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11471893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185000 + ... + 185061.

It is an arithmetic number, because the mean of its divisors is an integer number (2960496).

Almost surely, 2^11471891 is an apocalyptic number.

11471891 is a deficient number, since it is larger than the sum of its proper divisors (370093).

11471891 is an equidigital number, since it uses as much as digits as its factorization.

11471891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370092.

The product of its digits is 2016, while the sum is 32.

The square root of 11471891 is about 3387.0180099905. The cubic root of 11471891 is about 225.5338172792.

The spelling of 11471891 in words is "eleven million, four hundred seventy-one thousand, eight hundred ninety-one".