104208509 has 4 divisors (see below), whose sum is σ = 104258016. Its totient is φ = 104159004.

The previous prime is 104208497. The next prime is 104208523. The reversal of 104208509 is 905802401.

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 a cyclic number.

It is not a de Polignac number, because 104208509 - 2⁴ = 104208493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104208529) 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, 21449 + ... + 25854.

It is an arithmetic number, because the mean of its divisors is an integer number (26064504).

Almost surely, 2^104208509 is an apocalyptic number.

It is an amenable number.

104208509 is a deficient number, since it is larger than the sum of its proper divisors (49507).

104208509 is an equidigital number, since it uses as much as digits as its factorization.

104208509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49506.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 104208509 is about 10208.2569031152. The cubic root of 104208509 is about 470.5810062361.

The spelling of 104208509 in words is "one hundred four million, two hundred eight thousand, five hundred nine".