8199581 has 4 divisors (see below), whose sum is σ = 8830332. Its totient is φ = 7568832.

The previous prime is 8199571. The next prime is 8199589. The reversal of 8199581 is 1859918.

8199581 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 3960100 + 4239481 = 1990^2 + 2059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8199581 is a prime.

It is a super-2 number, since 2×8199581² = 134466257151122, 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 (8199589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315356 + ... + 315381.

It is an arithmetic number, because the mean of its divisors is an integer number (2207583).

Almost surely, 2^8199581 is an apocalyptic number.

It is an amenable number.

8199581 is a deficient number, since it is larger than the sum of its proper divisors (630751).

8199581 is a wasteful number, since it uses less digits than its factorization.

8199581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630750.

The product of its digits is 25920, while the sum is 41.

The square root of 8199581 is about 2863.4910511472. The cubic root of 8199581 is about 201.6495328050.

The spelling of 8199581 in words is "eight million, one hundred ninety-nine thousand, five hundred eighty-one".