2291863 has 4 divisors (see below), whose sum is σ = 2619280. Its totient is φ = 1964448.

The previous prime is 2291851. The next prime is 2291867. The reversal of 2291863 is 3681922.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3681922 = 2 ⋅1840961.

It is a cyclic number.

It is not a de Polignac number, because 2291863 - 2⁹ = 2291351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291867) 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, 163698 + ... + 163711.

It is an arithmetic number, because the mean of its divisors is an integer number (654820).

2^2291863 is an apocalyptic number.

2291863 is a deficient number, since it is larger than the sum of its proper divisors (327417).

2291863 is an equidigital number, since it uses as much as digits as its factorization.

2291863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327416.

The product of its digits is 5184, while the sum is 31.

The square root of 2291863 is about 1513.8900224257. The cubic root of 2291863 is about 131.8447631762.

The spelling of 2291863 in words is "two million, two hundred ninety-one thousand, eight hundred sixty-three".