2191841 has 4 divisors (see below), whose sum is σ = 2222784. Its totient is φ = 2160900.

The previous prime is 2191823. The next prime is 2191873. The reversal of 2191841 is 1481912.

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 a cyclic number.

It is not a de Polignac number, because 2191841 - 2¹⁰ = 2190817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191841.

It is not an unprimeable number, because it can be changed into a prime (2191811) 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, 15365 + ... + 15506.

It is an arithmetic number, because the mean of its divisors is an integer number (555696).

2^2191841 is an apocalyptic number.

It is an amenable number.

2191841 is a deficient number, since it is larger than the sum of its proper divisors (30943).

2191841 is an equidigital number, since it uses as much as digits as its factorization.

2191841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30942.

The product of its digits is 576, while the sum is 26.

The square root of 2191841 is about 1480.4867442838. The cubic root of 2191841 is about 129.8981648244.

The spelling of 2191841 in words is "two million, one hundred ninety-one thousand, eight hundred forty-one".