195809245 has 4 divisors (see below), whose sum is σ = 234971100. Its totient is φ = 156647392.

The previous prime is 195809227. The next prime is 195809261. The reversal of 195809245 is 542908591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542908591 = 1097 ⋅494903.

It can be written as a sum of positive squares in 2 ways, for example, as 22781529 + 173027716 = 4773^2 + 13154^2 .

It is a cyclic number.

It is not a de Polignac number, because 195809245 - 2⁹ = 195808733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19580920 + ... + 19580929.

It is an arithmetic number, because the mean of its divisors is an integer number (58742775).

Almost surely, 2^195809245 is an apocalyptic number.

It is an amenable number.

195809245 is a deficient number, since it is larger than the sum of its proper divisors (39161855).

195809245 is an equidigital number, since it uses as much as digits as its factorization.

195809245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39161854.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 195809245 is about 13993.1856630290. The cubic root of 195809245 is about 580.6900674746.

The spelling of 195809245 in words is "one hundred ninety-five million, eight hundred nine thousand, two hundred forty-five".