8201609 has 4 divisors (see below), whose sum is σ = 8832516. Its totient is φ = 7570704.

The previous prime is 8201603. The next prime is 8201621. The reversal of 8201609 is 9061028.

8201609 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 1951609 + 6250000 = 1397^2 + 2500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8201609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8201603) 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, 315434 + ... + 315459.

It is an arithmetic number, because the mean of its divisors is an integer number (2208129).

Almost surely, 2^8201609 is an apocalyptic number.

It is an amenable number.

8201609 is a deficient number, since it is larger than the sum of its proper divisors (630907).

8201609 is a wasteful number, since it uses less digits than its factorization.

8201609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630906.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 8201609 is about 2863.8451424614. The cubic root of 8201609 is about 201.6661560749. Note that the first 3 decimals are identical.

The spelling of 8201609 in words is "eight million, two hundred one thousand, six hundred nine".