8997581 has 4 divisors (see below), whose sum is σ = 9043452. Its totient is φ = 8951712.

The previous prime is 8997553. The next prime is 8997587. The reversal of 8997581 is 1857998.

It is a happy number.

8997581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8649481 + 348100 = 2941^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 8997581 - 2⁶ = 8997517 is a prime.

It is a super-2 number, since 2×8997581² = 161912927703122, 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 (8997587) 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, 22640 + ... + 23033.

It is an arithmetic number, because the mean of its divisors is an integer number (2260863).

Almost surely, 2^8997581 is an apocalyptic number.

It is an amenable number.

8997581 is a deficient number, since it is larger than the sum of its proper divisors (45871).

8997581 is a wasteful number, since it uses less digits than its factorization.

8997581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45870.

The product of its digits is 181440, while the sum is 47.

The square root of 8997581 is about 2999.5968062391. The cubic root of 8997581 is about 207.9897446250.

The spelling of 8997581 in words is "eight million, nine hundred ninety-seven thousand, five hundred eighty-one".