195978271 has 4 divisors (see below), whose sum is σ = 196131600. Its totient is φ = 195824944.

The previous prime is 195978269. The next prime is 195978281. The reversal of 195978271 is 172879591.

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

It is a cyclic number.

It is not a de Polignac number, because 195978271 - 2¹ = 195978269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195978281) 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, 74731 + ... + 77308.

It is an arithmetic number, because the mean of its divisors is an integer number (49032900).

Almost surely, 2^195978271 is an apocalyptic number.

195978271 is a deficient number, since it is larger than the sum of its proper divisors (153329).

195978271 is a wasteful number, since it uses less digits than its factorization.

195978271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153328.

The product of its digits is 317520, while the sum is 49.

The square root of 195978271 is about 13999.2239427763. The cubic root of 195978271 is about 580.8571067289.

It can be divided in two parts, 195978 and 271, that added together give a square (196249 = 443²).

The spelling of 195978271 in words is "one hundred ninety-five million, nine hundred seventy-eight thousand, two hundred seventy-one".