2291891 has 8 divisors (see below), whose sum is σ = 2690400. Its totient is φ = 1911168.

The previous prime is 2291867. The next prime is 2291893. The reversal of 2291891 is 1981922.

It is a happy number.

2291891 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2291891 - 2⁶ = 2291827 is a prime.

It is a Duffinian number.

2291891 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4166 + ... + 4683.

It is an arithmetic number, because the mean of its divisors is an integer number (336300).

2^2291891 is an apocalyptic number.

2291891 is a deficient number, since it is larger than the sum of its proper divisors (398509).

2291891 is an equidigital number, since it uses as much as digits as its factorization.

2291891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893.

The product of its digits is 2592, while the sum is 32.

The square root of 2291891 is about 1513.8992700969. The cubic root of 2291891 is about 131.8453000958.

The spelling of 2291891 in words is "two million, two hundred ninety-one thousand, eight hundred ninety-one".