4809891 has 4 divisors (see below), whose sum is σ = 6413192. Its totient is φ = 3206592.

The previous prime is 4809881. The next prime is 4809901. The reversal of 4809891 is 1989084.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (4809881) and next prime (4809901).

It is not a de Polignac number, because 4809891 - 2⁵ = 4809859 is a prime.

It is a super-3 number, since 3×4809891³ (a number of 21 digits) contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4809811) 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, 801646 + ... + 801651.

It is an arithmetic number, because the mean of its divisors is an integer number (1603298).

Almost surely, 2^4809891 is an apocalyptic number.

4809891 is a deficient number, since it is larger than the sum of its proper divisors (1603301).

4809891 is a wasteful number, since it uses less digits than its factorization.

4809891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603300.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 4809891 is about 2193.1463699443. The cubic root of 4809891 is about 168.8023201279.

The spelling of 4809891 in words is "four million, eight hundred nine thousand, eight hundred ninety-one".