9005581 has 8 divisors (see below), whose sum is σ = 10120320. Its totient is φ = 7951152.

The previous prime is 9005561. The next prime is 9005621. The reversal of 9005581 is 1855009.

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 9005581 - 2¹⁵ = 8972813 is a prime.

It is a super-2 number, since 2×9005581² = 162200978295122, 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 (9005551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14761 + ... + 15358.

It is an arithmetic number, because the mean of its divisors is an integer number (1265040).

Almost surely, 2^9005581 is an apocalyptic number.

It is an amenable number.

9005581 is a deficient number, since it is larger than the sum of its proper divisors (1114739).

9005581 is a wasteful number, since it uses less digits than its factorization.

9005581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30155.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 9005581 is about 3000.9300225097. The cubic root of 9005581 is about 208.0513695238.

The spelling of 9005581 in words is "nine million, five thousand, five hundred eighty-one".