2191863 has 8 divisors (see below), whose sum is σ = 2944368. Its totient is φ = 1450304.

The previous prime is 2191823. The next prime is 2191873. The reversal of 2191863 is 3681912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2191863 - 2⁶ = 2191799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191823) 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 7 ways as a sum of consecutive naturals, for example, 2256 + ... + 3077.

It is an arithmetic number, because the mean of its divisors is an integer number (368046).

2^2191863 is an apocalyptic number.

2191863 is a deficient number, since it is larger than the sum of its proper divisors (752505).

2191863 is a wasteful number, since it uses less digits than its factorization.

2191863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5473.

The product of its digits is 2592, while the sum is 30.

The square root of 2191863 is about 1480.4941742540. The cubic root of 2191863 is about 129.8985994287.

The spelling of 2191863 in words is "two million, one hundred ninety-one thousand, eight hundred sixty-three".