8381609 has 4 divisors (see below), whose sum is σ = 8670660. Its totient is φ = 8092560.

The previous prime is 8381543. The next prime is 8381627. The reversal of 8381609 is 9061838.

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 3341584 + 5040025 = 1828^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 8381609 - 2⁸ = 8381353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8381669) 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, 144482 + ... + 144539.

It is an arithmetic number, because the mean of its divisors is an integer number (2167665).

Almost surely, 2^8381609 is an apocalyptic number.

It is an amenable number.

8381609 is a deficient number, since it is larger than the sum of its proper divisors (289051).

8381609 is a wasteful number, since it uses less digits than its factorization.

8381609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289050.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 8381609 is about 2895.1008618008. The cubic root of 8381609 is about 203.1308094275.

The spelling of 8381609 in words is "eight million, three hundred eighty-one thousand, six hundred nine".