4781891 has 4 divisors (see below), whose sum is σ = 4863000. Its totient is φ = 4700784.

The previous prime is 4781873. The next prime is 4781911. The reversal of 4781891 is 1981874.

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 4781891 - 2¹⁸ = 4519747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4781831) 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, 40466 + ... + 40583.

It is an arithmetic number, because the mean of its divisors is an integer number (1215750).

Almost surely, 2^4781891 is an apocalyptic number.

4781891 is a deficient number, since it is larger than the sum of its proper divisors (81109).

4781891 is an equidigital number, since it uses as much as digits as its factorization.

4781891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81108.

The product of its digits is 16128, while the sum is 38.

The square root of 4781891 is about 2186.7535297788. The cubic root of 4781891 is about 168.4741306956.

The spelling of 4781891 in words is "four million, seven hundred eighty-one thousand, eight hundred ninety-one".