104609 has 4 divisors (see below), whose sum is σ = 106116. Its totient is φ = 103104.

The previous prime is 104597. The next prime is 104623. The reversal of 104609 is 906401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906401 = 241 ⋅3761.

It can be written as a sum of positive squares in 2 ways, for example, as 73984 + 30625 = 272^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 104609 - 2⁴ = 104593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (26529).

2¹⁰⁴⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

104609 is a deficient number, since it is larger than the sum of its proper divisors (1507).

104609 is an equidigital number, since it uses as much as digits as its factorization.

104609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 104609 is about 323.4331461060. The cubic root of 104609 is about 47.1183076519.

It can be divided in two parts, 104 and 609, that multiplied together give a palindrome (63336).

The spelling of 104609 in words is "one hundred four thousand, six hundred nine".