195609 has 4 divisors (see below), whose sum is σ = 260816. Its totient is φ = 130404.

The previous prime is 195599. The next prime is 195659. The reversal of 195609 is 906591.

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 195609 - 2⁴ = 195593 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195659) 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, 32599 + ... + 32604.

It is an arithmetic number, because the mean of its divisors is an integer number (65204).

2¹⁹⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

195609 is a deficient number, since it is larger than the sum of its proper divisors (65207).

195609 is an equidigital number, since it uses as much as digits as its factorization.

195609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65206.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 195609 is about 442.2770624846. The cubic root of 195609 is about 58.0492051725.

The spelling of 195609 in words is "one hundred ninety-five thousand, six hundred nine".