9481891 has 4 divisors (see below), whose sum is σ = 9488232. Its totient is φ = 9475552.

The previous prime is 9481889. The next prime is 9481951. The reversal of 9481891 is 1981849.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9481891 - 2¹ = 9481889 is a prime.

It is a Duffinian number.

9481891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9481861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456 + ... + 4378.

It is an arithmetic number, because the mean of its divisors is an integer number (2372058).

Almost surely, 2^9481891 is an apocalyptic number.

9481891 is the 1948-th centered pentagonal number.

9481891 is a deficient number, since it is larger than the sum of its proper divisors (6341).

9481891 is a wasteful number, since it uses less digits than its factorization.

9481891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6340.

The product of its digits is 20736, while the sum is 40.

The square root of 9481891 is about 3079.2679324801. The cubic root of 9481891 is about 211.6565207556.

The spelling of 9481891 in words is "nine million, four hundred eighty-one thousand, eight hundred ninety-one".