8481581 has 4 divisors (see below), whose sum is σ = 8928000. Its totient is φ = 8035164.

The previous prime is 8481559. The next prime is 8481593. The reversal of 8481581 is 1851848.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8481581 is a prime.

It is a super-2 number, since 2×8481581² = 143874432519122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8481511) 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, 223181 + ... + 223218.

It is an arithmetic number, because the mean of its divisors is an integer number (2232000).

Almost surely, 2^8481581 is an apocalyptic number.

It is an amenable number.

8481581 is a deficient number, since it is larger than the sum of its proper divisors (446419).

8481581 is a wasteful number, since it uses less digits than its factorization.

8481581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446418.

The product of its digits is 10240, while the sum is 35.

The square root of 8481581 is about 2912.3154018753. The cubic root of 8481581 is about 203.9352367148.

The spelling of 8481581 in words is "eight million, four hundred eighty-one thousand, five hundred eighty-one".