4081609 has 4 divisors (see below), whose sum is σ = 4664704. Its totient is φ = 3498516.

The previous prime is 4081607. The next prime is 4081613. The reversal of 4081609 is 9061804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4081609 - 2¹ = 4081607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4081601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291537 + ... + 291550.

It is an arithmetic number, because the mean of its divisors is an integer number (1166176).

Almost surely, 2^4081609 is an apocalyptic number.

It is an amenable number.

4081609 is a deficient number, since it is larger than the sum of its proper divisors (583095).

4081609 is an equidigital number, since it uses as much as digits as its factorization.

4081609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583094.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 4081609 is about 2020.2992352619. The cubic root of 4081609 is about 159.8123973062.

The spelling of 4081609 in words is "four million, eighty-one thousand, six hundred nine".