195609409 has 4 divisors (see below), whose sum is σ = 195674416. Its totient is φ = 195544404.

The previous prime is 195609383. The next prime is 195609433. The reversal of 195609409 is 904906591.

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 195609409 - 2¹⁷ = 195478337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195609499) 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, 27759 + ... + 34084.

It is an arithmetic number, because the mean of its divisors is an integer number (48918604).

Almost surely, 2^195609409 is an apocalyptic number.

It is an amenable number.

195609409 is a deficient number, since it is larger than the sum of its proper divisors (65007).

195609409 is an equidigital number, since it uses as much as digits as its factorization.

195609409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65006.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 195609409 is about 13986.0433647261. The cubic root of 195609409 is about 580.4924563095.

The spelling of 195609409 in words is "one hundred ninety-five million, six hundred nine thousand, four hundred nine".