8481991 has 8 divisors (see below), whose sum is σ = 9956000. Its totient is φ = 7073568.

The previous prime is 8481983. The next prime is 8482021. The reversal of 8481991 is 1991848.

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

It is a cyclic number.

It is not a de Polignac number, because 8481991 - 2³ = 8481983 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8481901) 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 7 ways as a sum of consecutive naturals, for example, 16116 + ... + 16633.

It is an arithmetic number, because the mean of its divisors is an integer number (1244500).

Almost surely, 2^8481991 is an apocalyptic number.

8481991 is a deficient number, since it is larger than the sum of its proper divisors (1474009).

8481991 is a wasteful number, since it uses less digits than its factorization.

8481991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32793.

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

The square root of 8481991 is about 2912.3857917522. The cubic root of 8481991 is about 203.9385227413.

The spelling of 8481991 in words is "eight million, four hundred eighty-one thousand, nine hundred ninety-one".