195523409 has 4 divisors (see below), whose sum is σ = 207024804. Its totient is φ = 184022016.

The previous prime is 195523403. The next prime is 195523439. The reversal of 195523409 is 904325591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157577809 + 37945600 = 12553^2 + 6160^2 .

It is a cyclic number.

It is not a de Polignac number, because 195523409 - 2²⁴ = 178746193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195523403) 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, 5750672 + ... + 5750705.

It is an arithmetic number, because the mean of its divisors is an integer number (51756201).

Almost surely, 2^195523409 is an apocalyptic number.

It is an amenable number.

195523409 is a deficient number, since it is larger than the sum of its proper divisors (11501395).

195523409 is a wasteful number, since it uses less digits than its factorization.

195523409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11501394.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 195523409 is about 13982.9685331835. The cubic root of 195523409 is about 580.4073723499.

The spelling of 195523409 in words is "one hundred ninety-five million, five hundred twenty-three thousand, four hundred nine".