8865581 has 2 divisors, whose sum is σ = 8865582. Its totient is φ = 8865580.

The previous prime is 8865499. The next prime is 8865583. The reversal of 8865581 is 1855688.

8865581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5924356 + 2941225 = 2434^2 + 1715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8865581 is a prime.

It is a super-2 number, since 2×8865581² = 157197052935122, which contains 22 as substring.

Together with 8865583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8865583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4432790 + 4432791.

It is an arithmetic number, because the mean of its divisors is an integer number (4432791).

Almost surely, 2^8865581 is an apocalyptic number.

It is an amenable number.

8865581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8865581 is an equidigital number, since it uses as much as digits as its factorization.

8865581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 41.

The square root of 8865581 is about 2977.5125524505. The cubic root of 8865581 is about 206.9676176717.

The spelling of 8865581 in words is "eight million, eight hundred sixty-five thousand, five hundred eighty-one".