11841891 has 4 divisors (see below), whose sum is σ = 15789192. Its totient is φ = 7894592.

The previous prime is 11841881. The next prime is 11841917. The reversal of 11841891 is 19814811.

11841891 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11841891 - 2¹⁷ = 11710819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11841811) 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, 1973646 + ... + 1973651.

It is an arithmetic number, because the mean of its divisors is an integer number (3947298).

Almost surely, 2^11841891 is an apocalyptic number.

11841891 is a deficient number, since it is larger than the sum of its proper divisors (3947301).

11841891 is an equidigital number, since it uses as much as digits as its factorization.

11841891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947300.

The product of its digits is 2304, while the sum is 33.

The square root of 11841891 is about 3441.2048762025. The cubic root of 11841891 is about 227.9329019239.

The spelling of 11841891 in words is "eleven million, eight hundred forty-one thousand, eight hundred ninety-one".