2257891 has 4 divisors (see below), whose sum is σ = 2261392. Its totient is φ = 2254392.

The previous prime is 2257883. The next prime is 2257909. The reversal of 2257891 is 1987522.

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 2257891 - 2³ = 2257883 is a prime.

It is a Duffinian number.

2257891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2257861) 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, 471 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (565348).

2^2257891 is an apocalyptic number.

2257891 is a deficient number, since it is larger than the sum of its proper divisors (3501).

2257891 is an equidigital number, since it uses as much as digits as its factorization.

2257891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500.

The product of its digits is 10080, while the sum is 34.

The square root of 2257891 is about 1502.6280311508. The cubic root of 2257891 is about 131.1900781648.

The spelling of 2257891 in words is "two million, two hundred fifty-seven thousand, eight hundred ninety-one".